Can I legally do art commissions on a student visa in Japan?

Hi everyone!

I’m thinking about doing art commissions while in Japan, but I don’t want to break any laws. I have a student visa with permission to work 28 hours per week as arubaito, but I’m not sure if that includes self-employed art commissions.

Is it allowed? Do I need to apply for any additional permits to do freelance art?

by Victorex123