In this specific case, I see one photo has barcode which usually means it is not front side. But I’m sure I saw many products that had many front sides with different design, so my question is still relevant.
Maybe the one that has the most useful information ? However, as you’ll add the other one too in the photos, contributors will be able to see both.
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Of course I add them all 
Basically I just take a picture of all sides separately, add them as additional photos in the app and only after that set/crop them to relevant goal specific photos
The problem is useful information is not defined as well. The main goal of front side to sell you the product which means that just bigger picture can be more useful for this goal. Or it means literally more information about the product? Etc.
By the way today I found more relevant example for this topic with front sides:
Product barcode: 0077975022757
In this case it is even more clear. The main difference is only orientation. If some store prefer to store this product horizontally, it can use horizontal version. If other other store prefer to do it vertically, it can use vertical version of its front side.
My key problem with OFF is not even techical issues, but full unexistance of any data consistency, which means that most of the time everyone make edits based on their vision. And it makes life harder literally for everyone. Programmers and data re-users should take into account millions of possible combinations, that thousands of users do instead of just asking contributors to make their edits according to some style guidelines to make life easier. In the same time contributors need waste many time deciding how to do and enter every type of data in the best way according to their knowledge and sense instead of just reading the style and best practices guidelines.
Product barcode from the beginning: 5201360639007
Or even this optiom: