#5: Does product gallery show thumbnails of other available images?
If product gallery contains 2+ images, you should clearly show that to motivate users to browse product images. The more they engaged, the easier to persuade them to buy.
If users see all images (product in use, from different angles, closer and further, in details) they will be more motivated than users who just see main image which eventually will help you to sell products.

That's why it's very important to show image thumbnails instead of just little grey dots as many ecommerce stores do. It really motivates users to browse product photos.

Puravida shows just little grey dots below main image, while Etsy shows small image thumbnails to motivate users browse product photos
Useful tools:
Shopify app to show nice and functional image gallery with thumbnails -
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