A few points I would make.
My own personal opinion would be that for a professional layout, like it seems you are going for, backgrounds and things like animations can hurt you more than help.
Window dressing is best used to hide the flaws of a product by taking some of the potential customers attention away from the actual product, and focusing it in other areas.
It has the effect of diluting the product focus.
A professional layout in any form of media is usually a very clean one, it concentrates the customers focus to the product or service, without letting the focus drift by admiring something that is not remotely related to the product or service being advertised.
The term commonly used is vampire marketing, meaning that the focus is being sucked away from the actual message. You know those adds you may see on TV sometimes, the ones where you can watch an add a few times, know it when it comes on in front of you, but struggle to remember what it is actually selling?
It's because your attention has either been focused on something within the ad that is not relevant to the main message or they simply have to much going on in the ad, having the effect of diluting your attention!
It really comes down to your market, for example, a young kid may respond well to buying a video game with a game graphic type of layout because that highlights what the game is all about and then draws their attention to the product.
It strikes me that your products are aimed at the more mature home decorator, and are unique enough to focus full attention upon them.
There are quite good detail, however I would try and add even more, group it together better, and don't get carried away with large fonts.
Large, bold and different coloured fonts, when over used will detract from any attempt to have a professional looking listing. Keep them to a bare minimum to create maximum effect!
Double check the grammar, that is letting the listing down.
Watch your pictures, the shot of the frog's back shows the air holes in the plaster and cheapens the whole product. Describing the hook in the back for hanging would be plenty enough information, no one needs to see the actual hook.
You need to promote the product in the best light possible, and 37 good pics are no substitute for 1 bad one. The customer will always focus on the bad pic, not the other 37 good ones.
I would suggest the listing focus more on the artist, and perhaps this is where a html platform would allow you far more flexibility to produce a quality listing.
Take a look at some art listings from professionals, draw some inspiration from their experience in market art pieces, because that is essentially what you are dealing with here.
You also need to keep in mind that the world economy is in the gutter, and sales right across the board are down. Try and compensate for that by using multiple advertising platforms to increase your exposure.
Ebay's traffic makes it an excellent front line, but there are plenty of other free listing opportunities out there that you can exploit at no extra charge to yourself, while increasing your chances of making a sale.
Ok, probably gone on enough for now....lol
Good luck with it!