well to be honest i did use some of the sponsors you talk about.. and you can still make good thumbs from their content.
but .. you should use sponsors that have nice content so you can get your site going.
push "More Comus Thumbs Sites Here" to the bottom .. you don't get nothing for giving free traffic a way.
for better teen sponsors.. go
http://www.vd9.com/se/teens.html
look at the galleries .. use the sponsors that you like the galleries of.
good luck with your site..