I wish I also have a talent with art. For me as along as you have skills or talent to offer, you can earn regardless of the means of payment. Maybe you can just ask someone to pay you in bitcoin in exchange of your art? Would it be too much to ask to see some of your art works?
Its not about what type of payment or cryptocurrency, i think it is more of how can he earn some bitcoin/other cryptocurrencies. The easiest way is to ask his clients to pay him through cryptocurrency specially if the clients is far from him, having payments through digital fits that problem. You can also have your own website and then integrate crypto payments but that requires you some money in able to it but that will be the (i think) the best way of earning crypto.