Your light source is coming from all over the place. Try sticking to one area.
Other than that. This is pretty cool!
Here, I just scribbled this. Check it out if you want.
I start with the outline, then dump fill my colors. I then make a seperate layer simply showing where to put the shading, and I work things out from there. In case you can't tell, he has an orb that generates light.
Whoops I only now realized how awkward the one on horn is. Otherwise it was positioned from above. Kind of. To be honest not sure from where exactly. Ligh sources are my weak spot so I agree that they always are crazy.
The light source is crazy! There's light in front of his arm, over his tail, under his horn, and behind him!
I see Dat Dither.
But, seriously, there is a lot of dither.
reminds me of my old work ^^... nice
you'll be great someday, if you continue