Thanks alot for all the feedback, I've updated it a little. Mostly following Hatches' example about banding and anti-aliasing. First version to the left and the updated one on the right.
I left the thick outline, mostly because of my personal taste. ^^;
The shoes I really need alot of help with!! I just don't know what to do with them to make them look smooth but also give them a little contrast in colour. =) Any ideas?