I think this is a very interesting concept indeed, and I do like the way the composition is done. There's a very nice balance in the picture, and it does bring your attention quite nicely to the subject matter. The color tone does bring it out quite nicely.
That being said, I do have, a couple of things to suggest, technique wise -
The cutting out of the man at the top could be better, in my opinion, especially the portion of his hair. I would suggest painting his hair back in, to give it a more detailed look, or using some brushes to help you with that.
Another thing would be picture quality. I do suggest trying to look for pictures of similar quality, so as to give your piece a better cohesive feel. Right now, the textures, the man at the top, and the suit are all of different qualities, and it is slightly jarring.
Shadows at the bottom - With the light source where it is, I feel like the suit should have a shadow stretching forwards into the picture with a little more intensity, not just a shadow at the bottom of the feet. Some highlights on the man would also be great, to show the areas where he is affected by the light source.
Overall, though, I think it's a pretty good idea; I love the concept that you have for it, and that little blurb that you've written in the description.
yep, about the sources, is very hard to find what you want, i spend much time looking images, but i will do some things you suggested me for improve my art, and i will replace it, thanks for the critique!
Haha, I hear you. I spend a lot of time looking for sources as well.
Usually, if I do want to use sources of different quality, I'll try to match them - maybe I'll smooth things out, or maybe I'll add some noise, or something like that.
No problem, and good luck with your art!