hi,
i sometimes square. i also try to keep in mind the dimensions of etsy cropping. that helps me a lot since i have an idea of what i want to show up in the different etsy frames once i upload my images.
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the dimensions of pictures in your shop and in treasuries (first number is the pixels of the width -
shop gallery view: 170 width x 135 height pixels
shop thumbnail view: 75 x 75 pixels
shop item listing view: 570 pixels - with the with the alternate views thumbnails (60 x 60)
the same dimensions apply to treasuries.
this is the link to the etsy's sizing for images.
http://www.etsy.com/teams/7435/diy-product-photography-how-to-hacks/discuss/6870187/page/1/?post_id=...