An epic, futuristic cityscape oil painting: a red portal, a solitary figure, and a colorful sky over snowy mountains.
A detailed 3D render: a futuristic cityscape with a monumental red portal, its double rings emitting a vibrant glow. The portal stands tall against a red-roofed building, while a solitary figure admires the alien landscape, surrounded by snowy mountains and a colorful sky, blending nature and technology.