Make a prompt for SD depicting a  anime portrait of a happy anime man with extremely short walnut hair
A medium shot anime portrait of a happy anime man with extremely short walnut hair, grey-blue eyes, wearing a t-shirt, his whole head fits in the frame, solid background, head shot, by Stanley Artgerm Lau, WLOP, Rossdraws, James Jean, Andrei Riabovitchev, Marc Simonetti, and Sakimi chan, trending on artstation