If you are doing this for your shop, then the key visual or copy should be the most interesting and eye-catching element of your shop, not Etsy. And honestly despite all the noise around the Etsy brand, not a lot of people outside of the handcraft community are familiar with Etsy so I'm not sure if just using their brand name is going to simply drive traffic to your shop. Even if it does raise interest, you want people to go to YOUR shop, not exploring on Etsy in your competitor's or playing with the not very helpful search engine (and get frustrated and leave, as my friend did).
I just went to you shop and took a quick look. Your work is interesting but under a traffic light or around the high ways, cars are driving by fast and they are also not looking at your work up close. Collage can look like a plain image from far and you don't get to appreciate the beauty of it. I think those placements are not suitable for your work. An eye-level street facing larger size poster will work much better. If you have to go with those because of budget to begin with, maybe try to play up with copy (headlines) more, which will need to be able to turn heads and stop traffic (literally!), and use your work as a decoration.
If you are doing this to drive people to Etsy, then you should discuss with the Etsy team and get their approval in the use of the Etsy brand elements.
