Sketchy skeletons in a closet

[Sketchasaurus]

The differences between male and female skeletons is generally very slight. And the variance differs from person to person. That skeleton in question looks like it's a 3D model and looks fairly androgynous from what I can tell.



A large difference between male and female bodies is fat distribution (which also varies depending on different factors) But generally, women have fatty tissue localized in their hips/thighs and chest, whereas men have most of their fat localized more prominently in their abdominal region.
However, using multiple references is a better way to learn, and practicing general things before tackling on a project is better than jumping into it. It's a "learn to walk before you run" kind of thing, so multiple references and multiple sketches are essentially a requirement before coming even close to a final model sheet.