I'm by no means an expert, but I'll share my views and hope they help
When uploading images to Etsy I alway upload large ones, that way a person can click on them and see the real detail in the piece. I find with lampwork and gemstones larger images helps to show the buyer the quality of the materials
For example, on the second image of the bracelet you can't really see the crystals very well, but a large image would help show the cut of them better. If your camera can't take large images and retain the quality then I would recommend using the macro setting to take close ups of certain aspects of the piece so the buyer still gets access to detailed shots
I think the bracelet could be shown in a more flattering way, but I know it's hard sometimes. If it was flexible bracelet I'd suggest drapping it over something, or laying it out in a different way, but I know that isn't an option with memory wire, so maybe you could prop it up against something. Maybe loop it around a vase or something so the dangle could be shown well...dangling rather than laying flat?
I also agree with Gay that it's good to try and use all your photos. Showcase your piece from every angle you can
Hope some of this helps