I'm not a seasoned veterans, but thought I'd chime in :)
I would look to do something a bit more fun with your banner. Maybe find a way to help the text pop out a bit more since the background is pretty busy. I'd also look at getting a nice logo together with an unique font instead of the very common script font you have.
Most of the photos of items are good, but they could probably have a bit better lighting. Also a few of them are blurry, maybe you can try using the macro setting on your camera to get good close detail shots?
Finally, I got this advice from others -- try to continue growing your inventory. People like to see a shop that has a lot of things, maybe they consider it to be more successful or something? My sales really increased after I had 50-75 items.
Best of luck!