Well, it's certainly a nice model, but I feel I must be slightly more reserved than the many other posters here...
First up, your photoshopping is perhaps a tad extreme. The first picture especially is waaaaaay too bright and contrasty. The others seem much better, with good detail and ok colour balance, although I would say that they need a little more contrast.
As for the model itself, bits of it look great.
The tromp l'oeil battle damage is nice, especially on the chainsword side. However, I think that many of the 'chips' are rather large, and would have been better off modelled onto the mini as opposed to painted (especially where they run over several surfaces/edges).
Personally, I think there is a bit too much 'grime' on there, and it applied in a somewhat random selection of places (although I may be wrong about that).
Although it looks pretty good on the chainsword, it doesn't really seem to 'fade out' on the legs especially, which makes all of it seem a little clunky in my opinion.
The bolt pistol almost seems to come from an entirely different model somehow, both in terms of cleanliness (or, I suppose, lack-of-dirtyness) and general painting. It really doesn't seem up to the standard of the rest of the mini.
A few things I really like about the model, to hopefully make you feel happy and fuzzy (again), as well as giving you (hopefully) a few things to think about for next time:
I love the helmet, I love the 'U' icon, I love the majority of the trom l'oeil (altough the blue is much better than the black).
Really nice work, and it's going to be interesting to see where you go from here.
-t.