Wow, you have so many products!
I agree about the funny descriptions, lol.
I don't know too much about Etsy, but it'd be nice if there was a category view, like if I wanted to look at all the earrings at once.
About the photos, I think brightening them would be nice. If you do decide to reshoot, I recommend shooting them either outside, or by a really bright window, without flash. Natural sunlight is the best light to work in, because flourescent lights throw off all the colors. It's better to start with the best photo you can get, rather than trying to fix everything later in Photoshop. Also, check if your camera has a macro mode (close focus); it's usually the little tulip/flower symbol. I think that'd help for taking pictures of your jewelry. Hold the camera super still, or the images will come out a little bit blurry: brace the camera against something, or even better, use a tripod.
Okay, sorry about the photo Nazi-ness, but I just really like to help people take better pictures, and using flash is the devil.
Good luck to you and your sister, your products are all really cute!