Um not gonna lie its very noticeable that your still starting off in photoshop. You really want to work on blending, lighting and flow pretty much the essentials. You should also try to learn the rule of thirds with text.
To answer your question usually working with the foreground and background helps. but to get more indepth you want to concentrate on the lighting of both the focal fore and background. Color burn, bluring, and dodging the images really help. If you want download some of my psds which could really help you or just work with some tutorials. However try to follow step by step and work into your own style.
EDIT-Also gradients and adjustment layers contribute alot.