Lots of good ideas above. I'm going to jump at this from a slightly different angle.
A good exercise, if you're willing to try it out, is to sit in whatever room you find comfortable and then describe it in writing. No limitations. Ideally, this might be your bedroom. Provided you aren't a medieval monk, live an extremely spartan lifestyle, or are not in prison currently, you'll have a lot of stuff around you to describe.
Don't just describe the walls, roof, floor and lighting. Describe what is around you and imagine you're telling all of this to an audience that is hanging on your every word. You are describing this scenery as the first introduction/chapter of your book on your life. If you have a stuffed animal on your bed, what is it and why is it there? Do you burn incense, spray perfumes, or do you have a mouldering stack of pizza boxes in the corner that gives the place an aroma? What kind of lighting do you prefer in that space? Where are things located and why do you have them there? Do you think you could move freely in that space in the dark? If you were to walk around in the dark, tell us what you'd feel or touch to get your bearings going from your bed to your door.
Now, do that kind of thing with other spaces. If you go to class, describe the lecture hall. Describe the atrium you might spend some time at before or after a class. Describe your favorite place to get coffee. Describe a location that is important to you from a memory. Go out sometime, provided you can, in the rain or a safe place at night and think about what is going on around you. How would you describe this setting to someone who doesn't have your eyes, your other senses, or your ability to be present there.
Try some exercises in exploring different sensory contexts with scenes. Maybe within your own story as a side thing to get your imagination flared up and build a routine for yourself to think about these things as you write. What does a place smell like? What does the ground feel like if you were to walk on it barefoot? How bright or dark is that place? Would you want to be there, or would you rather avoid that place? What kinds of memories and feelings might this place stir up in your characters?
Some big tips when describing scenes is to never use exact or objective descriptions. Avoid the "The room was 10 feet by 15 feet with a domed roof, and halfway down the adjacent wall was a wooden door about 6 feet in height with rusty hinges." That kind of thing might be fine if you're just starting out playing a game like Dungeons & Dragons, but even then after that first bad session, you should be using other things to describe the scene.
Sometimes it helps to grab some scene shots from movies or just ambient concept art sketches from the internet. Make a folder of these and tag them to key ideas or places for your story. Draw from these as 'reference shots.'
Another idea is to go back to movies. Watch some YouTube videos on cinematography of major directors you might like. How does Alfred Hitchcock or Stanley Kubrick do a shot for a scene? What kind of feelings come out of certain lighting, props, camera angles and the like. Put yourself into a scene and describe that as an author. What would it be like to be inside the apartment scene with Jules and Vincent during the "What?" scene at the start of Pulp Fiction? How would you describe what it is like inside Bilbo Baggin's house in the Shire? How can you emphasize the feeling of fear and dread if you were describing a section of the Nostromo from Alien?
Don't get caught up in exactness. Although you can go nuts with exercises to see what feels right to you and what doesn't. Look at ways to tone stuff down to the bare points you need to convey the image or feeling to your reader. Try exercises where you're only allowed to describe a dozen things in a room. Then a half dozen. Then three things. Then a single object and it's profound significance.
Another technique is to experiment with 'coax' words. Try describing an object or area. List all the ways you would describe it. Like 20 words or so. Then re-describe that object or area without using any of those words you listed. Try using disjointed wording or metaphors. Some will be really silly like a 'spicy sunset' but you'll soon find disjointed words that add a poetic atmosphere to things. Describing a rain like droplets of blood on a drum-skin captures more than saying the weather sucked that day.
Never shy away from doing some exercises with your writing.
Also always remember when to cut your scene and gloss over down-time with writing. You don't have to describe every day and night of an epic quest. It's enough to drop in a quick sentence or paragraph of glossed over information. Or better yet, describe it through character interactions and dialogue. Maybe one character snored too loudly and it's driving another of their adventuring companions nuts.
Artists need to gather up references, styles, and learn techniques. Musicians need to learn chords, melodies, and the like. Writers... Well we gather personal experiences. That's what we draw from. Memories. Feelings. Perceptions. And yeah, a few fancy words or grammar uses.
You need to go out and watch the world around you. Frame it in your mind. Then use words to paint that canvas the same way you see it. The point is, it's how you would see it, or one of the characters in your story. No one else can see it that the same way.
Have fun with it. Everything you do to describe a scene, gives you mileage as a writer. Every memory you have. Every feeling you have. Every way you can communicate things to others.
I'll end this here or else I'll end up going off about the art of things.
As far as what I do... I come to writing from a background with art (specifically concept art and illustration) and from having done a lot of courses in film (film directing, screen-writing, and the like). I frame my scene. I use a character to pan through it like a camera would. I try to convey as many senses as I can, although I heavily depend on visuals. I also like to sneak in exposition whenever possible.
Some people absolutely hate my style. Those people tend to be really left-brained computer programmer types. I've yet to have any difficulty with right-brained creative types beyond my wordiness (in both description and exposition). Your mileage may vary with the way I might say to do things. So, go with what I mentioned above and just have fun exploring -your- way of doing things.