I have wanted to draw this type of half pin-up half sugar-skull girl for a long time. As Mel Milton, the amazing Disney artist says in an interview when Will Terry asks him about art, you can draw robots and spaceships, monsters and muscled dudes and get away with the lack of things, anatomic or other flaws. However, drawing pretty girls is another cup of tea. Spoiling things can make them repulsive or ridiculous instead of irresistibly attractive. Link to the interview.