Love your hats so very cute !
I don't have an etsy shop yet, I have one set up but holding off until I am really sure that it is something I want to do. I do have a face book page thou. Your pics are nice, they show your work really well and yes there are a few that are too dark. You can lighten them using
Picmonkey. The only thing is that I would suggest displaying all of your item on the same background. That's just me thou, Im OCD and I like an uniform look. Also you could maybe have a couple photos of the hats being worn to show how they fit.
I have heard that pinterest does wonders for getting small business known. It makes it easier to repost links to the general public that wouldn't otherwise be known.