#9: Is product variants selection integrated with product gallery and shows images of chosen product variant?
When users engage with product variants (colors, materials, type, etc), ideally they should be able to see how this product variant looks in the product gallery. It will be clear for them that what they see is what they get.
Otherwise, if they didn't see chosen product variant before in the product gallery, they will have a question: "How this product variant will look?". And it can be a point of friction in the purchasing flow.

Bad example on Leesa website:
I chose EU Single product variant, but in the product gallery I see Double size:
Good example on Puravida website:
I chose Green color of the bracelet and I see it in the product gallery, I clearly understand how my product will look and don't have any hesitation about it.
Made on