The "Curves" option should be there on Photoshop. Look on the right under Adjustments.
The little icon should look like a graph with a line going in a diagonal upward direction.
Clearly improved and the one AceLeaf made is even better. Comparing both I think you should make elements like the text and c4d look more distant, more transparent and making the render's face stick out more.
so much better than your last sig like ace leaf said you can do so much more with curves
I've said to you already, Aceleaf too, and I'll tell you again: Go find tutorials. One learns a lot from those.
Nice work for a beginner.
Critique: You need some work on the flow of your foreground to background. I feel that the image is too flat because of this. Instead of layering an image on top of another one without transition, try blurring some objects behind the person. This will create a nice focal point on him.
Try to improve on complementing your colors together. Sure, red and black compliment each other, but only if used correctly. If one object is black while the other is red, it creates too much of a contrast and is not pleasant to the eye.