A hyper-realistic depiction of Thor, the God of Thunder, featuring intricately detailed and symbolically rich armor reflecting Norse mythology, wielding Mjölnir in his right hand with lightning crackling around him. He stands powerfully at the grand gates of Valhalla, with a stormy sky as his backdrop, his eyes glowing with divine energy and a determined expression. The scene is set in a striking vertical composition, capturing the awe-inspiring and otherworldly essence of the mythical landscape.