In all instances of monetary gain made from an image where a model's identity can be clearly discerned/recognized, you will always need a release from that person or persons pictured in the photo.
That is not a true statement, here in the USA anyway.
Selling printed images with people in them to individuals is an editorial use, not a commercial use, and is not considered publication even though monetary gain is involved. Most editorial uses don't require a model release.
This very issue is why I mentioned, "You need to understand the differences between the definitions of editorial use and commercial use. They are not as obvious as many would suppose."
A model/property release is usually not needed to protect the photographer. The model/property release is for the protection of the model and the
publisher of an image. Sometimes the photographer is also the publisher.
Model release laws aren't as cut-and-dried as, say, traffic laws.
I want to add some notes about , "where a model's identity can be clearly discerned/recognized".
That doesn't require a face, and it's generally the model that makes the initial determination. For example, an image of someones forearm, but there is a small scar. The scar may be enough to make the person recognizable enough to necessitate having an model release on file.