Are you getting enough views? In my experience, if something isn't getting views, I know I need to work on titles and tags (as well as outside marketing). If it is getting views, but not sales, then I know I need to look at something on the product page that may be stopping people--the photos, the description, price, etc.
I think your tags are pretty good, but they could be tweaked. For example, this listing:
https://www.etsy.com/listing/113231368/dandelion-picture-necklace-fine-artThe words that are in your title should also be in your tags. If you search the first three words of your title "dandelion picture necklace," you'll see 30+ listings (including yours), but if you search "dandelion necklace," you'll see 1,000+ items. You'll want to make sure that your item is in that second group to reach a larger audience. If it were my necklace, I would add "dandelion necklace," "dandelion pendant," and other specific terms to my tags.
Best of luck!