Is the problem that the photo is cropped from a woman who is nude or that the woman is beautiful or that a photo of a woman would be used at all?

I watched the documentary produced by the campaign Losing Lena (https://www.facebook.com/codelikeagirlau/videos/985614161797...) here are the complaints:

1) Female student says high school students made jokes about the photo and made her feel that women were made to be a joke

2) Female researcher says when the photo goes up on a screen "everyone laughs.... well not everyone"

3) Female math professor says the photo symbolizes the role women played in technology: "beautiful young woman in the photograph not the one doing the coding"