This is Girl 12’s hanga interpretation of Kumite or sparring.
Hanga is where they carve a picture into a piece of plywood, paint it with black ink and stamp it onto a piece of paper. When they’re carving it, they have to keep in mind what parts they need to come up white so all the white that you see is carved. They also have to remember that the stamp will invert the photo so they have to keep this in mind too, which gets tricky when there in writing in the print. If you look closely, you’ll see there’s kanji on the karate gi.