on the shot you have with the two men standing by the plane, you might want to think of adding a "drop shadow" on all of the elements individually. This is a labour of love a lot of the time. The best way to play with the drop shadow is to duplicate the cut out image, fill it with black (preserve transparency) and then take it off after you did this. Go ahead and soften your shadow the "scew" it.

Now that I have completely messed with your mind - go as far as you can and I'll help you when you get stuck.

There are easier ways to do a drop shadow but you don't have total control over it.

marwen