As it says on the picture, there's no wrong way to draw; in fact, if you wanted to ignore everything I'm saying here, please do.
HINT IT"S BECAUSE I REALLY DON"T KNOW WHAT I"M SAYING
OKAY LETS BEGIN
The full body:
The problems with yours seemed to be that it was VERY thin and the hips and thighs were to thick in relation and too far down. Despite what others have told you, I think your guide lines are actually quite good. I can't remember exactly, but I think a human body is 6 or 7 heads tall, which is what you did. The torso and shoulders are two heads and the legs are ~three. If you doubt that, you can always measure yourself. Your shoulders should also have been broader, which would make the arms hang further away from the body. The arms might also be a bit longer. If you look at where the arms come to on a normal person, you'll see it's the upper half of the thigh (depending on arm length). Your legs and feet were alright, though they should be a more even thickness.
Sitting people:
There were pretty good; two things on the first one; I'm not exactly sure about the position. The arms didn't appear bent, but I couldn't see them on the ground, which they would reach if they were straight, so I just drew them bent. Also, you would probably see the other leg. The other one was good, so I turned it into a frog. Happy frog. HUGE PIECE OF ADVICE: act out everything you draw. Whatever style you draw in, it helps immensely to have a model. If you can't find another person, use a mirror. YOU WILL NOT REGRET IT.
The face:
If you've looked at my gallery, you'll see that my faces are cray stylized. Here's what I can tell you about proportions, though: Eyes are in the middle of the head. The space between them is one eye and the length between them and the bottom of the nose is also one eye. The ear connects on the same line as the corner of the eye and the bottom of the nose. Once again, you can check on your own face.
HOLY INFO DUMP BATMAN
Like I said earlier, there's no wrong way to draw, there are just tips and proportions to increase realism. ON WHICH I'M PROBABLY WRONG.
Anyway, here's the important things:
1) Use models or photographs for positions
2) Draw from life
3) Do little sketches, like between the sitting people, before you draw.
4) Though there's a stigma about tracing, there's really no problem tracing pictures from an artist whose style you like, AS LONG AS YOU DON'T CLAIM THEM AS YOUR OWN. If you do this, you should probably not post the pictures to the internet.
5) Most importantly, PRACTICE CONSTANTLY. FOr real. Draw DAILY. It wall start to come naturally eventually.
I hope I helped a little TT.TT


