>>47839439Markings that are meant to evoke eyelashes. Mewtwo has obvious male pecs and hard, square facial features that offset its femininity. Mewtwo and Lucario also come off as stern, stoic, serious, whereas Cinderace feels more like a pouty tomboy or something.
Anon, I don't care whether or not it looks female to you, because this kind of thing is pretty irrational and depends on the traits to which a person is drawn. But the combination of soft, cutesy features and feminine traits (pronounced hips and thighs, eyelash-markings) hits as female for a lot of folks.