Ok, ill try to CnC to the best of my knowledge. First of all, the 3 different elements (BG,render, FG), just don't go together. I'm not very good at flow yet,but I do see light pretty well, and you have a light source behind the dragon, yet the light seems to be striking the front of the mountains in FG. The lighting behind the dragon is not represented in the BG. Personally I wouldve gone darker in back to provide some contrast. Though it demonstrates perspective, it lacks depth. Nothing is blended very well.
On the good side, it was a very good idea and showed some creativity. Practice will turn those good ideas and creativity into great images eventually.