I like your control over the background ... it sets her off nicely. Your overall image is very much under-saturated. (her face almost looks black and white .. it is so under-saturated) Your lighting could be a lot better. Study how to control light with both positive and negative reflectors. Put a positive reflector in place, to shine light where you want it, and negative reflectors to block light, where you don't want it.
Here is my version of your image. I hope it helps to inspire you.
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D. Craig Flory PPA Certified, Cr.Photog., ASP
loryphotog@mindspring.com