You could look into setting up a site to sell your work. And i think you should consider subtracting expenses, then donating 1/3 and keeping 2/3. You should have a little nest egg for a rainy day, especially if it comes from your own toil and trouble. You already have a big heart. That much will never be in question. Giving away 100% of everything you make isn’t necessary though, and you should feel good about giving yourself permission to be monetarily recompensed for something beautiful and artistic that you put a piece of yourself into, each and every time you create a new piece of work. Give yourself permission to also enjoy the financial fruits of your labor.
Because you deserve, and very much should, be allowing yourself the kindness that comes with doing that for yourself, and allowing yourself the extra enjoyment that would come from recognizing that you’re allowed to bask in any successes you create for yourself - including in letting yourself be happy about any extra money you make.