Sketch two simple head shapes side by side
Add basic body shapes under each head
Draw the hair in the style you want for each character
Add facial features with simple eyes, noses, and mouths
Outline the ears, necks, and shoulders
Add matching or contrasting outfits
Refine the arms, hands, legs, and feet
Clean up the sketch lines
Ink the final outlines
Erase the extra pencil marks
Add color if desired