If you are referring to the actual photography process prior to listing, there are a ton of videos out there on eBay with tips. The biggest thing I'd suggest is keep the background free of other stuff and if you don't have lighting, try to take photos outside and/or near natural light.
Don't put items on your carpet and/or bed, etc. I didn't look at your listings so not accusing you of that, but nothing worse than seeing people's feet and stuff in items they are selling.
