This is REALLY nit-picky, so you'd probably be fine to just leave it as is. The mouth's placement looks odd to me. feels like it should be raised a little bit so it won't feel like it's floating....same with the eyebrow closest to us. It seems a little too long or needs a slight rotation. Besides that, fun shapes and palette. :-)
I like the idea of a hairstyle series. It sounds like a lot of fun. I like the layout of this peice, but I have a few notes... if you don't mind. I think lengthening the braid and perhaps follow the shape of the bug pink curve would make it more interesting. The braid is pretty perpendicular, a little movement would go a long way. The teeth look a little painted on. Showing the dark inside of the mouth would be indicative enough of the shape and depth of the mouth. I love the character in your banner, and I think having this character have some of the same personality and value depth would really sell this in your portfolio.
Thanks, Hollie and Cassie!