I personally think keeping it like the stock template to start is smart...When you launch your site, a lot of things can go wrong with it so one less thing to worry about is a + initially...
You can always make it "pretty" later as long as the bones are rock solid (payments, security, speed, etc)...
That said, you DO only get 1 change to make a first impression so there is "risk" that it won't look as nice as a pro themed site, but overall, compared to other carts I've seen, I've been ok with the default/plain look of out of the box Abantecart. I've customized all the colors and that's relatively easy to do to get away from the blue, but as long as the site is fast, secure, and it simply "works" (checkout)...I think you can worry about that after you get more sales/money.
Ultimately, your customers care more about speed, security and price than anything else IMO.
From your site, the picture looks a little blurry so maybe you can watermark them and post higher scans. Maybe a pic of what the frame looks like and the pic IN the frame would be helpful.