I agree, but most of the pictures look like stock photos or clipart. In my opinion, the first genuine photo are #16 and #19 (in my personalized order produced by Google image search, your numbers may vary). Anyway, the apparent genuine photos also have a good variation.
My complain is that most of them use white coats, so they look like Chemistry/Biology/Medical scientific. I never saw a Physics scientific with a white coat.
Theoretical physics is harder, they look like normal people (i.e. mathematicians) until they start to talk about the real word. I prefer to discuss writing in paper, but for a photograph the only sensible solution is to write a bunch of slightly related equations in a blackboard.
(And there are many other science branches. For Geology you may put someone with a bunch of rocks, but I don't know a real geologist so it may be not a representative image.)
My complain is that most of them use white coats, so they look like Chemistry/Biology/Medical scientific. I never saw a Physics scientific with a white coat.