Here is my opinion:
For the inking, I noticed that all of your lines were the same thickness. I was thinking that you could vary the line thickness and get that extra 'life' into your character without making it any different to your sketch style. From the sketch peice, I can see area's where lines stop and other times when there is 'lighter' lines. It makes it more interesting to look at because the lines are varied then just solid lines. That's all I got for now.