Nice work. Your blending is great. I like the concept.
As Argos stated, the watermark is a bit distracting. The other things that I noticed is that the leaf appears flat. It needs stronger shading and highlighting to add more depth. The highlights are reversed from the face to the chest. The green on the lips look s painted in.........maybe change the blending mode to restore some of the lips texture.
All in all, nice work!
I understand that there are people who are anti-watermark, however, when I occasionally visit stock photo sites, watermarks don't prevent me from purchasing those photos, so I don't understand why it is distracting to some. It is only distracting to those who allow it to be. Some of us are sensitive/proud about the work we do, and want to brand it. You hardly can be sure these days as to whether an image is actually owned by the sender, because people either misuse or misunderstand fair use.
In terms of the "flatness" of the leaf. I did think of that, but because he is a leaf, I decided that in this case the flatness was appropriate. The other thing was, because of how the photo as taken, I wasn't sure how to go any further without him looking overly processed. But the bottom line is, I was satisfied with my result.