I think it's the legs... The thighs are a bit longer than they should be. Which also means the arms are slightly too long. Ha ha, and I don't mean to nit-pic, but the toes are really wonky! [HERE] is a great and simple guide to how feet look in different angles. It doesn't over-complicate the issue, which I like.
I think your style is cute, though, and high-five for D+D!! I've never played a Halfling myself. I'm more of a human-type myself.