The shading looks nice and natural. The only real "fault" I can see is the shading on the right leg (from his PoV). The shading at his... crotch, makes the leg look a little weird, but overall, you've done a great job with it.
Thanks, I haven't done a lot of work with shading so it's nice to know I didn't do it completely wrong, haha.
Now this is just cute!
Really nice work!