Adding and changing a portrait in Family Tree Maker for Mac 2 (2012) is one of the activities that isn’t very Mac-like. Mac users expect intuitive control of an app. The intuitive action here is to drag and drop the image onto the portrait in the pedigree view or editing panel. Alas, it doesn’t work that way yet.
Having pictures of my ancestors in my pedigree view helps me connect to my main purpose while doing family history research: to revive and keep their stories alive. Like you, I do this by discovering and crafting stories about them that my family members are eager to hear and share. Their faces help create a sense of familiarity.