This was one of the most enjoyable constructs I've built so far. Have to change the paint scheme tho, which kinda sucks. The Camo just doesn't work well enough.
The color scheme is fine. You might want to add something to it, a third color like small dark green or black spots or patches. What's letting you down is the metallics, which look very flat, and the odd pale hash marks. I can't make out if that's supposed to be battle damage, camo, or highlighting. Still, overall an outstanding model which must have been a bear to assemble and paint.
What doe you mean "the camo doesn't work"? I like it. It really looks like a camo patern that could be used in a reallife situation, in stead of the sometimes flashy and brught "camo's" they use in WH 40K. But if you want to repaint it.. don't, like KERPAINT sais: build a new one!!