Give your child crayons and drawing paper. Ask her to draw a person. Take note of the details in her depiction of a person. Recognize that a drawing of a sphere with lines is a developmentally appropriate depiction for a young child's first attempt. Praise any scribbles that she places on her paper to draw the picture.
Encourage your child to draw people whenever you give him art supplies. Point out the body parts he has drawn and ask about any additions to his picture that you can't identify. Talk with your child about all the parts of the physical body and where they are located to get him thinking about adding them to his drawings of people.
As your child progresses to drawing a full body with a neck and trunk, suggest that she add defining features. Ask her to draw hair and clothes, eyeglasses and hats on the people.