You are right, I believe emotions most times play a major role for people who need a muse to draw.
I remember asking my learners to draw whatever the like to draw that year while others scribbled cartoon characters, look alike of mummy,daddy and their teachers, a particular child had a weird drawing of himself and siblings ( as explained) and coloured weirdly too. When I pointed my HOD to it she confirmed the boy had a traumatic experience from an accident and that his brother was still in the hospital in coma.