well are you going for realistic proportions? If you are, you are quite off. Your figures measure about 5.5 heads. Realistic proportions are about 8 heads high.
What do the red lines indicate? Normally we divide lengths according to the height of the head; your red lines seem a little arbitrary, what is it based on?
Your male figure is pretty stiff. Legs arent perfectly straight like that and shoulders arent so boxy.
The most important thing though is, are you using a reference? If you want to learn proportions you need a reference, you cant just make it up and hope you get it right. If you have a reference you should post a link to it, if not you should get one.
Once you have a reference divide it up according to head lengths, and do the same for your drawings and see where you went wrong. Being critical and finding where you went wrong yourself will be more helpful than me just telling you every wrong thing. For example you might count how many head lengths the torso is on your reference and then do the same on your own drawing. Do this for all body parts. Look for other relationships too. For example find how far down the hand goes if the arm is straight down. Youll notice in goes to the crotch. Check how wide are the shoulders compared to the hips. Just look for as many relationships as you can think of.
Also with your reference pay attention to the shapes of things like the shoulders, arms, and legs. Notice the legs and arms are not straight tubes. Granted, drawing the subtle curvature of legs and arms at this scale is kind of hard, at smaller scales perhaps impossible.
Are you trying to learn proportions or trying to learn pixel technique? If you are just trying to learn proportions and anatomy, ask yourself whether pixel art is really your best medium. As I already stated, the limited size is going to prevent you from being able to draw the subtle curves of things like the arms, and attempting to make things pixel perfect will just slow down your progress. If you want to stick with digital art, I suggest going bigger and not worrying about pixel level detail. Or you can try sketching on paper, as you will be able to do them faster and learn more.