Hi!
I will start with your banner- I can't read the last word because the background is too dark. I would consider changing the font to a lighter color so that it is easier to read.
When I looked through your shop, your photos look good, but they look inconsistent to me. Some are on white backgrounds, and some on top of book pages, and it just kind of confuses the eye a little when I browse through. I really like what you make, I think re-working the photography a bit could really help with your sales.