Just a quick note about proportions.

The proportions used in figure drawing are:

• An average person, is generally 7-and-a-half heads tall (including the head).
• An ideal figure, used when aiming for an impression of nobility or grace, is drawn at 8 heads tall.
• A heroic figure, used in the heroic for the depiction of gods and superheroes, is eight-and-a-half heads tall. Most of the additional length comes from a bigger chest and longer legs.

These are pretty standard things that have been around since the 50s.