Hi, for the most part I agree with the suggestions so far. You definitely need an image on the homepage... you're selling art! If it's a case of not wanting to hightlight one artist over another, then get the picture to generate randomly!

On a curatorial level, you've got quite a variety of styles on the site, and this might be working against you. On one hand you have some very modern looking 'fine art', and on the other you have some very traditional illustration work. Both are fine, but you have a bit of an image problem. Your customers don't think you're very discerning... sorry if this is harsh...