it also depends on the type of site
is it a showcase of your abilities and info about your shop
or is it a straight up t-shirt sales vehicle, where you just want to sell your designs on apparel
check out the 'rate my ecommerce' type posts
here,
and see what tickles your fancy
there should be a good sampling of both styles and everything in-between
then at least you can say i just want tee's or tee's on models
(don't do the torso-only thing, the headless/armless body is psychologically jarring/off-putting to some)