I think you need to make it easier for people to get started. I almost didn't signup because I had to create an account before I could view any of the photos for sale. It would have been much easier to jump in if I could have just started browsing photos. Make make me signup after I have gone through a few pages of pictures.
The real kicker was when you asked for my credit card right away. I am a big fan of credit card up front on subscription services with a free trail. But I just wanted to see the product. There ins't anything for me to be excited about yet. Luckily I noticed that I could just click something in the menu to skip this step. I would put of asking for the card until you they go to make a purchase. You have my email address so you can already follow up if I abort at the CC step later.