okay a few anatomy tips for drawing the difference.
Male's have wider shoulders, and thicker necks. and, more of a square jaw
female's have smaller shoulders, thinner necks and a rounded jaw
also, torso wise, females waist almost sinch above the hips, while a males is kinda more by the chest.
and of course, a females chest compared to a males.
hope i helped at least a itty bit x3