Okay. Here we go.
We all have the same menu, I don't know why you bothered posting a screenshot of yours, it's the FPSC default.
The second screenie looks decent, a bit large and a bit too empty. Same with the third screenie.
And the fourth one. Your shadows are a bit screwed up also.
The fifth one looks good, but I think you need a bit more scenery.
Same thing with the sixth.
The seventh also looks good, but I think that it also needs more scenery.
The last screen looks good, except that I think it, you guessed it, needs more scenery. Also, that wooden desk seems out of place.
Basically, add more scenery and adjust your lights.