Btw, I know that evan's arm doesn't have correct proportions, I'm just too lazy to fix it
Basically, this is based off of that theory where your brain changes your thought process and how you think depending on who you are around. For example, someone would think more creatively/funny if they hung around an artist/musician, but would think more technical/skillful around someone you perceive as smart. Also, your opinion on someone/how you feel about someone is a factor. Like, you like them: More calm and more likely to bring up relationships. You hate them: More tense and thinking shortly. More likely to bring up aggression/things that you dislike.
With this, when presented a prompt, such as "These two characters are friends", you draw them based off of your experiences and who is around you, but all unconsciously.