My first thoughts; some of the highlights could be brought out a bit more. My first instinct on this model would be to paint some of the lighter scales in the same method as Menelker's Tyranids. The claws seem pretty basic (and it looks like they're showing wear) but that can be improved after basing. I like the colors chosen for the mouth. My number one problem? The eyes are completely lifeless. A gloss coat would help, but making them glow a bit with a dark green -> light green -> yellow highlighting, and then perhaps a pupil, would help with a focal point.