Not being in to the printing side of things myself, I would have to agree with Dave on this one. Why do you not open yourself up to the web site market by running your images through a batch to lower the size resolution to 72 or 100 dpi? This would, I'm guessing, bring in more sales without any overhead cost. You could also have set it to sell by license per site if you had the back end to track it.

Other than that
On your product detail page, the add to cart button is too high and the line above it goes thought it. Also please remember I'm not into printing and I do not mean to offend anyone here, but looking through your site I personally got the feeling that I was looking at a photographer selling his high resolution images from his vacations. The images in the fashion, model area made me think that since they all were of the same person "all but one", that this person was either your daughter or a friend. I also felt that the selection of images was limited and did not cover all categories such as cars/ trucks, heavy equipment, moons/stars, eyes/legs etc, etc.

Lastly I noticed that your home button links to stockaphoto.com/index.php . You should change this to stockaphoto.com/ to prevent any duplicate content issues.

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