Happy? Look at his hands, mouth and eyes.
He's not feeling brave either, which can again be seen by looking at his hands, mouth and eyes.
The correct answer is he's feeling frightened. We have several clues to tell this. His eyes are wide and his mouth is open. Also, he has a sword in his hand and has the other hand up. He looks like he is ready to defend himself. At this stage in the play Richard is being haunted by the ghosts of the people he killed to become king.