Yes, I took a photo and added a cartoon to it. All my stories are illustrated and I often use photos from Unsplash and Wikimedia to create my own cartoons and animations. I use those sites because they have permissible licenses that allow you to reuse and modify images, even for commercial purposes.

T-shirts are not something I’ve considered seriously. Although I’ve considered them non-seriously:

https://medium.com/the-haven/its-time-to-capitalize-on-my-followers-b0169d6e284c

I feel flattered that you like my toons so much that you’d consider them for your own work. But as of now, I’m not interested in taking on any additional side projects.

Thanks so much for your interest! :)

P.S.: Have you tried upwork? I haven’t used the site myself, but I know you can find illustrators there for hire.