Create a hyper-realistic depiction of Thor, the God of Thunder, featuring exquisitely detailed armor adorned with intricate Norse symbols. He wields Mjölnir in his right hand, surrounded by crackling lightning that dances across his form. Thor stands poised at the grand entrance of Valhalla, exuding an aura of divine power and majesty, the mighty gates open behind him, revealing glimpses of the ethereal hall. The scene is captured in a vertical aspect ratio, emphasizing the towering presence of Thor and the grandeur of his celestial surroundings.