>>14622920People often say that in anime, men and women look exactly the same and the only way to find the difference between them is by their hairstyle or clothing.
Sometimes that's actually true, but most of the time males are taller, have bigger noses and jaws, broader shoulders, thinner eyes and rarely also a slightly darker skintone.
This one on OP's image is also visibly anxious and that also gives it away
