Hmm. Interesting idea, but I'm not sure it would work consistently for most actors. I tried a few google image searches and, while we mostly get expected results for the well known mainstream actors, results usually suck for everyone else. As Lepa said, the ideal would be for TMDB to have such a facility where users could upload those contemporary pics. Let's wait to see if that happens.
I guess it depends who you test. I've been shocked at the gaps in the tmdb/omdb images.
Gary Lockwood, one of the 2 stars of 2001 is not there. Yaphet Kotto of Alien and Live and Let Die and Homicide (tv) is not there. I have lots and lots of actors, significant ones, who are just missing.
When that happens, a google search always returns something usable. If the search is "imdb actor name" a good image is almost always the first result.
When a Director image is missing, as happens a lot, it throws off the formatting of templates. It might be nice if there were an option to generate a silhouette image for cast/crew when the search fails. With these new templates, actors without an image aren't in the film at all apparently.
Regarding age appropriate photos, from what I saw, those conversations on tmdb are years old and were rejected, so I don't think it's happening. We're on our own.
I suppose one could manually run the convert.bat script for every missing image against a manually downloaded photo, but since there's no easy way to extract the individual actor/role names from the MC field, that will be a lot of manual typing.
Re the google search, I don't think the spotty results you saw matter much, because it's only used as a refinement after grabbing tmdb. If it were the primary, consistency would be a problem.
But what I'm suggesting is: oh, this tmdb image is bad or missing, let's see if a refinement search does better.... Ah, there's a good one, use that one! Or, nope, nothing better, I guess I'm stuck.
It never makes things worse, it can only make things better.