Nice design! I like his color scheme. If I may offer a small critique, it would be that his tail does not have enough muscles to be supported realistically. You could easily fix this by adding some back muscles on top of the tail where it connects with his haunches (right now there is a rather sharp dip - which I think is the only thing that makes the problem stand out in conjunction with the large tail). It doesn't need much, but it will really help!
Check out some dinosaur anatomy or even just dino pictures, and you can see what I mean - [link][link]
Thats true actually - anatomy always seems to take a back seat when Im doing references xD Thanks for the links, and its something I could easily change in sai : D It will probably give him a smoother, more graceful look too. Thankyou so much!