Context is important - I have spent a large part of my career in veterinary schools, which for 30 years at least have been increasingly “girls’ clubs” (something like 75-90% of undergrads are female, around the world: we are still trying to work out why). So it’s always a huge contrast when I go to engineering-type groups where the split is reversed. I can see how such an image in the comp sci / engineering context is problematic, given its origin and history.
I show Lena, once, to my undergrads. I give them an explanation of the background and now, thanks to this discussion, a link to the NPG comment. There’s a huge canon of Lena-copies in the literature: I want my students to know what they are looking at and not be surprised, ignorant or naïve, when they come across a copy, and to understand why people used to use Lena, and now they don’t.