NIce start on the shop, and great designs & cards they are on!
You’re already getting good advice for the shop–lots of suggestions in the Etsy forums and user guides, too. One thing I didn’t see mentioned, the white acrylic on white card–very hard to see design! I’d suggest using a dark card with the lighter earrings, and light with dark.
And I’m a fan of grey background vs. stark white (I use honed grey limestone tiles for my leather goods) but since the material of the earrings and cards have so much natural texture, a smoother background may be better? Just an opinion. That, or less of the background so less competition between the texture of the background and your earrings themselves.
And as you’ve already noted, first pic should be of only a pair that are being sold–then other pics can show options with multiple pairs if there’s color choice or anything–otherwise showing more than one pair the price is for can be confusing as to what is included with the price–don’t assume folks will read the description. As someone once wrote in the forum, which I love to quote “take pictures like there is no description, and write the description like there are no photos”.
And as a consumer, a shot of the back of the earring itself would be great, especially with post earrings, I like to know where the post is in relation to the earring–center, or at the top? Affects how it fits on the ear and can look…
And include a shot with something common, like a quarter, for scale. Make use of as many of the 10 pics that are allowed!
Good luck! Great designs.
And use tags… and patience. Etsy is huge, and jewelry is very competitive category within, but it’s a great opportunity for your items to be found globally!