Done by a black artist. These are normally traditional portraits....
https://pagesix.com/2018/02/14/barack-obamas-portrait-may-have-been-made-in-china/
Sources say artist Kehinde Wiley — who painted the former president before a background of greenery and flowers — has studios in China and produces most of his work there.
“It’s his base of operation,” said art critic Charlie Finch, who has known Wiley and appreciated his talent since they were students at Yale. “He has dozens of assistants working for him.”
While Obama sat for Wiley for several hours, the portrait may have been sent to China to be completed.
“Normally, Wiley sketches out the important parts, and assistants fill out the rest,” Finch told me.