I think you're trippin'. On most of the t-shirts the picture is going to be something like 5 inches across. To me, that's a big picture staring up out from my chest... I guess it's a matter of taste... I'm working on a different design altogether now, but when i try your suggestions it looks crappy to me (primarily because i have crappy software, so w/ bigger text on a picture that will be apparent.)
if you have good image editing software run w/ it.. the picture came off of the ronpaulaudio.com front page.
Each of the different styled shirts also have the Ron Paul 2008 Hope for America Logo on the Back.
I welcome you to make any improvements that you'd like to this idea/design, but as of now i'm working on some others.