Your cards are so cool and unique! I would consider maybe arranging your shop by color to make it a bit less overwhelming, or like Lee said try some different angles so that it isn't the same shot through your whole page.
Looking at the tags used in this listing
http://www.etsy.com/listing/113819741/frog-paper-cut-card-for-men-and-womenI would consider instead of some of the one word tags you have used, to instead use phrases including the word 'card'. ('light blue card' 'original art card' 'wildlife card') Cram the word 'card' into every tag. Repetition is key to being found through search.
Good luck to you!