Ancestry.com member trees have persons and photos. Photos can be linked to persons. Simple.
The Tree section of FamilySearch.org has persons. The Photos section of FamilySearch.org has its own set of persons. Photos can be linked (tagged) to photo persons which can be linked (connected) to tree persons.
FamilySearch Family Tree has one set of deceased tree persons. FamilySearch Photos has photo persons that are unique to each user.
Two tree people can have the same name. Two photo people cannot. Each photo person must have a unique name.
Tree people can be assigned facts like name, birth date, and death date. These can be used to distinguish tree people with the same name. Photo people only have a name. One way to distinguish photo persons is to add the birth and death years to the person’s name.
Can a photo person have a different portrait from a tree person which can be different for each user? I’m totally confused on this point.
Should the same person be mistakenly entered twice, two tree persons can be merged. For two photo persons, delete one and reattach all its photos to the surviving photo person. The Help Center describes this eight step process. Repeat steps 6 and 7 for each photo.
On Ancestry.com with its one set of persons, if I change a person’s name, I change it once. Likewise with birth and death years. On FamilySearch.org with its two sets of persons, I must change it twice, once for the tree person and once for the photo person. Likewise with birth and death years if they have been used to make the photo person name unique.
In my opinion FamilySearch needs to unify its two systems of persons.