The first thing I wanted to share about pinterest was image sizes.
You'll notice, vertical pins take up more space and show up larger than horizontal ones. It's just the way pinterest is formatted.
Something I recently learned is that if you upload one vertical image to your Etsy listing, you can then pin it with your browser button.
I have an article I wrote on SEO that includes a sample image of how the different sizes images pin:
http://www.laurevansdesign.com/2016/01/tips-for-successful-etsy-shop.htmlanother tip- the ideal pin size i use is 735 x 1102 pixels