Some lines, which are supposed to be smooth, are edgy.
Wait, everything is the way TOO edgy.
If you are using Photoshop, use pentool. It makes lines more smooth.
For a sketch it isn't bad.
Although it would be better, if there were noticeble eyes.
Also in-game screenshots (or atleast spheres) are appreciated.
*Pssss, just between us, move your watermark to the center, because now anybody can easily erase it*