that is very nice. the way his pose was brought out makes me want to animate him, it is quite enlightning.
yes, it is true, it looks very rough. but if I was you, I wouldnt completly smooth out his outlines like everyone suggested, I think that sort of crustyness to the outlines kind of adds to his character and makes him look a bit sloppy and kinda lazy (as a character), I would barely have the outlines that cross trough the highlighted parts lit up just like solid colors, but not really AA every edge to death.
spend more time enriching the actual content, the shading of his armor and his sword.......that sword does need it's own outline shade though.