Well, to be honest, Children of the Halo is already finished. At least the first draft. The entirety of the first draft was posted (as I wrote it) on deviantart.com, and it's been read through by a few people, but the revision I've been posting has been much different in a variety of ways. (Got rid of some characters, tightened up various plot elements, renamed people, places & things.)
The feedback I've gotten thus far since I've started posting the revisions on Celephi has been nil, but feedback isn't my big concern.
So far as critique goes, however, I believe the only way you'll get better at writing is if people are brutally honest with you. Showing the story to friends doesn't always cut it, because (unless they too write) they're more prone to say "Hey, good job!" while your grammar, spelling and characters are total crap and wouldn't stand up to an even moderately decent critique. (As I learned when I first started writing.)
However, that's not to give any right to be rude when critiquing other's works. Mature, informed critique is the way to go about it. That, I'd take seriously. Rude critiques, however, just go into the trash...
In my opinion, anyway.