Hi Impact,
I took a look at your shop and think it looks fairly cohesive. Though you sell different types of accessories, I can tell by your photos, colors, etc. that the style is more or less the same for all the items. By the way, I think the technical term for cohesion is "branding," which is central to any type of marketing. Branding is not only how a shop looks, but how it makes you feel, etc.
That said, you can definitely improve your shop cohesion since you do seem to have an eclectic taste (not that that's a bad thing!). You can either do this by opening another shop as you mentioned before, or you can start shooting and setting up photos in the same "style."
I love looking at this shop:
http://www.etsy.com/shop/tamar?ref=ss_profile The artist's photos are all slightly different, but they are all in the same, whimsical, girlie style. Different things, but telling the same story.
As for me, I've been Etsy-ing for about 3 months and it took me several weeks to realize that I lacked a "style." I used to take my photos with a towel as my background (so embarrassed, looking back!), but now that I have a "craft supplies" background for my shots, I've noticed my views and favorites have gone up slightly. I had to re-vamp every title, tag and photo and spent a lot of time doing so. But I think it was worth it, and am always working on improving!
You're not the first one to wonder about "cohesion," and I wish you luck in a process that can be frustrating!
Aman