However once I'm able to mail physical items, you will have to pay for physical items, like paintings or figurines

The thing is, unlike most artists, I take requests, not comissions, but you can venmo a small tip. And I only do requests when I feel like it, but I'll suddenly automatically feel like it if you offer me more than 5 bucks, just coincidentally enough to hmm... buy a large frazil slushie where I live...