You have 2 lines of 30 characters each to work with. Likely they will be separated by a slash but as far as I know details for this are not regulated. Note tha

You have 2 lines of 30 characters each to work with. Likely they will be separated by a slash but as far as I know details for this are not regulated. Note that you need to submit proof. For an artist's name it needs to overshadow your common name in at least some parts of life and entry is at the discretion of the officer. Famously, a sex worker was not allowed to add her artist's name into her ID card.