Rei Himura

Your coloring on her hair and clothes are great, but the visible base throws it off as they're two different styles of drawing and brushes. Maybe if you were to trace the outlines of the base and color it yourself it'd match! Also with clothes, they aren't skin tight, even skin tight clothes go off the skin a bit. It'd really help with your art to make it all look and match. The hair is quite good, but usually withhair there are side pieces- or if it is open like your's, ears would be visible. 
These are just tips to help you make and improve your art.