The headshots in the Viewer are named the same as the actors are called.
E.g. "Tom Hanks.jpg".
Only exception is, that the following characters are replaced:
": " with " - "
double quotes with single quotes
And the following characters are removed:
"?", "\", "/", "*", "<", ">"
Birthyears would be attached in brackets, but usually they are not. Only if needed to distinguish. I think it is better if you would not add those.
The viewer handles alternate images for one person with postfix "_" + incremented number:
"Tom Hanks.jpg"
"Tom Hanks_1.jpg"
"Tom Hanks_2.jpg"
An output folder "CCViewer" would be fine.