Sit boy!
Nicely done, I like the red effect.
The shoes, though a minor detail, I think should be redone.
So much detail is placed in the whole body, yet when I see the feet...not much attention was payed there.
It also bothers me how I don't see a tail. In this form of pose (If he is on the ground)
A tail should be between his legs (Or if he is jumping) It should be shown slightly under his right leg.
I feel like I may be nit picking, but those are the things bothering me, everything else is wonderful!