Though I'd give you my two cents.
Bare with the unfinshed edit. (and the lack of a jacket)
I noticed your work relied heavily on the outline to give Canti shape, and while this isn't the worst thing you could do, you could better use the single pixel outline to define the basic shapes of his body.
The shading itself is really just pillow shading which is considered a huge no-no. Try to define a proper light source before you even head onto the shapes themselves, and don't be afraid of having light pixels border the dark one because that's a mistake I used to make when I started.
Final thing I'll say is Canti is slouching; not necessarily a bad thing, but it really takes away from his imposing self.
I guess from here I'll just link you to link you to Helm's
Magic thread which provided me with some glorious knowledge.
Also, good luck.
