I am certainly no expert but just a couple of observations in the listing below:
https://www.etsy.com/listing/199565720/hammer-embroidered-on-antique-book-page?ref=shop_home_active_...It looks like you have all the pertinent words in your tags but you can group them to more fully describe your item in one tag and then free up more tags for more chances to be found.
For instance you have the tags "art", "fiber art", and "embroidery" in there twice. Edit out the duplicates. Then you can combine "antique" and "framed art" to be one tag - that is still within the 20 characters allowed and more fully describes your item and frees up a tag.
I would also use tags like
hand stitched art, OOAK mans gift, embroidered art, framed art. Then of course don't forget to put as much of your title word for word in the tags - so you'll want something like Hammer Embroidered, Antique Book Page, Framed and Matted for good SEO.
I hope some of this helps if I haven't totally confused you. You have a terrific unique idea. I wish you much success!
Blessings,
Sandy