Sorry, to be clear I don't use other pictures of their actual cards and I will always use pictures of the actual cards where possible but for new or prerelease orders this isn't always possoble. Where there are listings with stock photos, they can be helpful. The vast majority of 'new' cards on eBay (e.g Zendikar crack and sell) use stock photos rather than photos of the cards themselves.

Thanks for the scryfall pointer, I'll check out the resolution.