I think the variety in your shop is fine for now. If you get many more handmade items, then you may want to go ahead and think about splitting your shop, but for now, I think your'e good. I personally feel like your shop sections do a great job of organizing the shop.
OK, just a few things I noticed-
Some of your clothing items are photographed on a bush. It doesn't fit in with the clean look of the rest of your photography, and it doesn't compliment the items you are selling.
With the exception of a few clothing items that are on models, most of your photography is on a clean white background. You have a few exceptions, and I don't think you really should. While it's not the most interesting background in the world, it's a neutral pallate that works with the very wide variety of stuff you have. Off the top of my head, the only time that you break away from the plain white background where I visually liked the effect as much was for (I think) pins with hearts on them- they were on a bright blue back ground, stuck in foam letters that spell out "hi". It's a fun image that really captures your attention- but it's distracting in your shop and doesn't fit in with everything else. It detracts from the overall "harmony", I guess.
The lighting in the pictures of some of the vintage jewelry doesn't look as good as the lighting for most of your other items. Makes it look drab.
I think it's great that you have inside pictures of the books you are selling. I'm tempted like you wouldn't believe buy that candy cook book!
You have your measurements in centimeters and inches. Awesome.
You need dimensions on everything. Your listing "Beutiful vintage enamelware casserole dish..." doesn't have any, just lists how much it holds by volume. I can't picture size based on that- maybe other people can, but I don't know what a 2 quart (or whatever size it is...) pan looks like. Needs physical dimensions.
That being said, I think that listing may have been the exception. For the most part you seem to be really good about putting sizes on stuff, but I wonder about also making one of your extra photographs be a picture with a ruler, just to give visual scale to the items.
Also, did I see that you just opened in October,and you already have 42 sales? That's awesome! Congratulations! Clearly you are doing something right!
Good luck!