OK, since you've asked, here's what I see. It looks like you could get trapped in there, if other customers came in behind you. I set up in an L shape, I think it's better for flow. I've seen an inverted V work also. It's more open than a U shape. The backdrop of gold-green-gold-green is too broken up, my eyes don't know where to go. You want the focus to be your tables with your product on them, and the broken up background doesn't help to focus your attention there.
Your banner is dark and difficult to read, and doesn't tell me what you're selling. The jewelry board in the front is not in a great position. If it were me, I'd get rid of that and get some "T" stands to hold those necklaces. I also agree that your table coverings are an accident waiting to happen. Adults may be careful enough to avoid tripping but a child could step on them and all of your lovely product would end up on the floor. If you don't sew, there are some great, fitted tablecloths out there, that aren't too expensive. Something like these, in polyester are practically wrinkle free, and that's always a plus.
http://www.amazon.com/dp/B008TLBABU/?tag=skimlinks_replacement-20
The area rug, while pretty, is another tripping hazard.
I'm not sure what's on the table at the back, it doesn't look like there's too much there. And there's something in the back left corner, dark colored, not sure what that is either, but if it were me, I'd get rid of all of that stuff at the back, and move the tables from the right side to the back, so you've got an L shape, and it opens up your whole display.
I hope this doesn't sound harsh. Sometimes we are too close, have looked at things too many times, and lose our ability to see things as customers do, for the first time. I've asked friends to critique my set up, and was surprised at what they had to say. Things I'd never noticed, or seen from the perspective of a customer. It's hard to hear when we've worked so hard, but the bottom line is to attract customers, and make sales, so I hope you know that this critique is meant to be constructive. Craft fairs are very competitive, you've got one chance to attract people into your booth as they pass by.....you've gotta grab 'em!!! Or at least your display does.
Changes don't have to be made all at once. I think all of us who do craft fairs have seen our displays evolve over the years. You could even ask customers....."I'm thinking about changing my set up. If you were me, and could change one thing, what would it be?" It might give you a good direction to begin. Best of luck to you, and many sales!