Ok, so you want a blunt critique. Here goes.
First impressions:
Yikes! (looking at the Frankenstein's monster on the home page). Gah! Don't know if I want to be on this page. Kinda freeked out a bit by some of this art work... This isn't my kind of thing. (After continued browsing...) Hmm, yeah there's a few pieces I like here. Like this one:
https://www.etsy.com/ca/listing/129057209/determined-expressionist-print-11x14?ref=shop_home_activeOk. First impressions over.
I think your pictures are amazing. Perfectly displayed jewelry and photos of your art pieces. Understanding that I am probably not your target audience, I didn't find any art pieces in your shop in particular that stood out to me as something I want to own. Brilliant pieces, but nothing spoke to me personally. If you want to go reach a broader audience, it might be worth trying a few new ideas. For myself, I'm a fan of inspirational posters and concepts. It might be fun to make some prints / posters with cool quotes from the people in your paintings or something like that to reach a broader audience.
I love the idea of throwing in magnets for free with purchases as an incentive. That's an idea which got me interested and if I had found something I wanted, I probably would have purchased just because there was that little extra thrown in.
Not that I'm an expert, but I think your shop is geared toward hipsters (just a guess) and as such, you might want to find some to ask as far as what you think they would buy and gear it more toward that market.
Anyway, those are my unbiased and inconsiderate thoughts on your shop. :D
Keep up the great work and you're sure to do well.
Best of luck!