I have never been one that critiques others websites, but I did take a look. My first impression before even going further to purchase or look for prices is that the shirts your showing in pictures look all wrinkled and difficult to see what quality they should be showing.
I agree with Steve Mann. I think you need some quality photos of your product first, because your customers need to really view something that looks very attractive for them to want to purchase.
Good luck , cute shirts.