Is it legal to sell pics?

[yyy]

If you do it as a job, that’s one thing. If you incidentally sell something you happen to own, that’s another thing. See here:

What are you allowed to do without a work permit?

The Employment Service Act states in Art. 43 that 除本法另有規定外，外國人未經雇主申請許可，不得在中華民國境內工作。 but does not define work. The Council of Labor Affairs (predecessor to the Ministry of Labor) clarified in 2005 in an interpretation letter (勞職外字第0940503946號函) that an activity does not require a formal contract or even payment to qualify as work, though it also said volunteer work in accordance with the Volunteer Service Act does not require a work permit. In 2015, the Ministry of Labor issued another inte…