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Something I learned from my art friends is that you should *use references* literally all the time for anything.
There's not better a tool for creating something than a pre-existing example of what you're looking for. And generally speaking, no, your memory is not good enough.
Even master painters and sculptors like to have a live human being to base their work upon.
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You can also use a proper copy of Facegen to get the geometry from photographs, then use Facegen Exchange/Faceripper to get the FGGS data from the FG file.
The point is you shouldn't rely on your mind's eye, because it's not as dependable as one might think.
Looking to life also helps you avoid falling in to repetitive or stereotypical designs. A lot of mods (and the base game for that matter) have a serious case of Same-Face on a lot of NPCs.