Keep your invoice items minimal. "Sketch", "Painting", etc. Doesn't need elaboration. I don't think you need to go as far as omitting the word commission entirely but at this point who knows. Make sure you've got the terms and conditions box filled out with /something/ too
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"This is payment for a custom artwork creation service, no physical goods will be shipped; digital files will be delivered upon completion. If requested, a refund will reflect the amount of service rendered at time of request. Completed work will not be refunded."

Good practice + extra protection
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Also goes without saying but don't just let people send you money directly, always invoice.

And for the love of god use a spreadsheet to track your income and taxes. Processing fees, currency conversion fees, and instant transfer fees are deductible and you wouldn't believe how much it adds up to
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I always struggled with what to put there, since I had an external TOS I was using already but this is nice and to the point, thank you!
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