Do your characters have some proportion issues? Do your male and female characters look the same? Keep at it and learn a few simple rules to make your characters at home in their bodies!
To carry your characters off, don't just focus on their faces: start by getting acquainted with their basic anatomy. Observe yourself in a mirror to see how the various joints are positioned and set them down on paper in silhouette form.
Head and body: Finding the right balance!
Putting each part of the body in its place
The spinal column is the median line for your character's body. To start with, you can draw it lightly with a pencil to keep the body symmetrical.
Then from top to bottom:
For your female characters: emphasize the curves!
For your male characters: avoid curves and focus on angles to make his body look heavier and more muscular.