A whimsical, photorealistic scene of a sleeping wolf pup with a shimmering mermaid tail curled beside an ornate stone fountain inside a sunlit greenhouse. Soft white fur, pink paw pads, a worn brass collar with subtle engraving, and iridescent fish scales transitioning into a flowing translucent fin. Water trickles from the fountain, creating ripples, sparkling droplets, lily pads and pink water lilies, and drifting pastel butterflies. Nearby an open vintage book, glass potion bottles, small copper cage, and oversized tropical leaves and potted plants. Warm volumetric sunlight streams through glass panes, casting soft rim light, lens bokeh and magical light orbs. Ultra-detailed textures: individual fur strands, scale microstructure, wet brick mortar, tarnished metal, dewy petals and realistic water reflections. Dreamy pastel color palette, cinematic composition, shallow depth of field, believable subsurface scattering, soft film grain, high-resolution fantasy realism, enchanting and peaceful mood.