Hi Lydia,
Your stuff is so cute!!
https://www.etsy.com/listing/99079282/kite-necklace-free-spirited-fly-a-kiteI LOVE this necklace! But I think the main picture is a little too zoomed in. I think maybe I'd prefer it zoomed out a bit more?
I like the thumbnail for this product:
https://www.etsy.com/listing/99066591/bohemian-beach-wedding-material-flowerso I think if you did the same thing for the kite necklace - like how you show where the necklace curves at the bottom - I think that would be better.
For this painting:
https://www.etsy.com/listing/154958803/iris-watercolour-botanical-watercolourI would suggest staging it (put it on a shelf with some other cute items & take a pic) as well as having a picture where you're holding it with your hand, so people can easily tell what size it is. (You can check out my shop for an example - for all my small paintings, the picture is my hand holding the painting)
Also, maybe you could custom arrange the order of your items. You could do a row of bracelets, a row of paintings, etc. That way people could more easily tell what's what and compare items. That's what I do with my shop. I don't recommend it for all shops, but yours is like mine - you have a variety of different types of items. For the items that are similar you could photograph them the same way (like you did with the bracelets) to make it a bit more consistent.
Other than that, I think your pictures look great. Your tags and titles look good too.
Hope that helps a little!
Heather