I would contrast the girl more to the background. In my opinion she seem a bit pale and she doesn’t stick out of the white background much.
Also I think you should give it a try with another sitting position. Like with her legs hanging from the plattform edge. Don’t know if it fits better, but I would try.
Thanks for your helpful critique.
MJayKa
she is too washed out in the image tone down the whites maybe or increase the contrast of her