"To commission a piece" means to hire or request someone, typically an artist or composer, to create a customized work of art, music, or literature according to your specific preferences or requirements. Full definition
To date, she's painted and sold more than 250 portraits of dogs and commissioned pieces of people's pets. (animalsheltering.org)
In this interview he mentions, and I've seen him do this regularly, that he will do commission pieces for $ 25,000 — $ 50,000 or more! (theabundantartist.com)
The show is the first of its kind in the region and features more than 80 pieces of jewellery created by leading Western and Middle Eastern artists, including some specially commissioned pieces. (gulfnews.com)