The bump on the hat is fine. There are some brands of hat (Kangol, in particular) that use a strong weave like that, so that's fine.
The lighting needs work. She pops out of the scene too much. There are highlights on her forehead under the hat where there should be shadow and the bounced light is too heavy under her chin and on her neck.
Her eyes are blue... everywhere.
The whites of her eyes shouldn't be blue at all. In that kind of lighting they should, at most, be an off white or eggshell color.
Almost there but not quite a finished image. Also, don't be afraid to use photoshop to help edit your images. You dont have to get it perfect in Maya all the time.
Professor of Digital Arts
Digital Media Arts College
Boca Raton, Florida