These can be some of the most interesting kinds of sigils to create, because they lend themselves to visual suggestion and graphic design. In this case, since it was very simple sigil created in just a few moments, the rough suggestion of the shape of a brain happened early in the creation process, and I went with it. While the end result doesn’t scream “MENTAL HEALTH … IT’S A BRAIN … GET IT?!!!” it does just slightly imply a few lobe-like structures here and there.
Of course, sigils don’t have to be visually evocative of anything. It’s nice, but it can become a little gimmicky and forced all too easily. In this case, the intentions were clear it was all in good fun. And that’s the sweet spot for any kind of similar magick. If you can be creative in your rituals, go for it. If it feels like doing your taxes, maybe reconsider what you’re doing and why.