Superhero playing tennis, ready to hit the ball. Full body portrait. Stoic and determined. White clothes, shield emblem. Low camera angle. Stadium. --ar 3:4 --sref <https://s.mj.run/ftRdRdbVRms> <https://s.mj.run/RkoqCSWfKi4> <https://s.mj.run/nYCouFz03oI>