very nice scene author...best of luck

At first glance I couldn't see it was a flower. But nice idea

Author, this is a great idea, but your source image is copyrighted. Please try to find one that is usable & resubmit!
Please read http://www.pxleyes.com/blog/2009/06/how-and-where-to-find-legal-source-images/

thanks , i tried again ! is it ok?

OK!

As you can see there's a noisy texture on the photo , maybe you can copy it on her face ( like in the original), so that it seems a real photo.

Try to make the skin look like it's on top of the skull by adding an edge to it, so that it has thickness. (Ctrl J the skin layer and move it up a bit, change it brightness- so that you can see it blend in, adjust with dodge/ burn).

cool work author...gl