No shadow? What's the triangular thing on her head?

Over all this is real nice image, how ever...like Nater says, hard lines gota go. I suggest taking your smudge tool, dropping the strength to about 20ish and give it a go over. Also there is one of your layers causing a mess. EG. The triangle in her head and the shadow thing following her back. Her bum is a little sharp too
If However your image is already flattened the above smudge method will help with them shadowy bit in conjunction with clone tool. The composition is awesome. Get in close and has a look over you work and clean it up, make it special.

The circuit board image would look better if it were warped to the contours of the body. The rest is good except for the jagged edge on her left arm.

thx for ur comment cmyk46, removed the jagged edges, and tried to warp the circuit board on her body, lowered the opacity, like it more this way, hope it looks better now