An ethereal, fantasy scene: a bright, mossy waterfall with a portal to another world, framed by a golden arch.
A detailed digital illustration featuring a luminous portal framed by a golden arch, revealing a multi-planetary scene. The central focus is a bright waterfall cascading down a cliff, surrounded by mossy rocks with a mysterious, fantastical edge. The overcast sky and bright lighting emphasize the allure of the natural and cosmic scenery.