Your photos are OK, but they don't say much. At least anything that speaks interest or excitment. They look like test shots to me. If you had something interesting going on it would / could be better.
Don't know about lighting. I do street work, so I take the light as I find and build on it. Blast away more and try differnt comps and angles.
If you know a gal, shoot her. Much more interesting subjects with gals...everyone loves em both guys and other gals! Put em in a bathtub and shoot them. Light paint them nude, goosebump em, or whatever you like.
If you don't have a gal, put the guy in the tub if you got to. But do something with them. I have the same problem with my own work. I am not a stager or director. I am a doc and street photog. So I shoot what is presented to me and don't stage things. So many of my photos don't have a lot of excitment in them...yet they still have some interesting features.
Dramatic lighting helps.
Photography of Daniel Teoli Jr.: Photo
Movement, motion blur and expressions also help. Maybe tell them to make some faces, shoot them tight and hdr em. Just try all sorts of things until you hit pay dirt.
With doc photography we don't have the luxury a set up photog has. They can reshoot the scene all week. We have to come up with something in a few blinks of the eye.
Good luck!