100% agree! I think the profile image being kept current is great, a no-brainer. However, for older actors, child actors, actors who have undergone cosmetic surgery or weight gain/loss, etc., I think a gallery would be helpful and insightful. Child actors' faces will change as they grow up, and older actors have probably been in the industry long enough that long-time fans will have seen them change visually throughout their career.
I also agree we might need a filter or stricter approval criteria, as some fans might take advantage of this kind of feature. I love photos of my faves as well, but photos that are actually helpful for the database may get lost.