What separates photorealism from photography-style
Photorealism in AI is not just adding the word realistic to a prompt. It requires simulating the entire pipeline of how a real photograph is captured: the physics of light, the specific behavior of camera optics, the rendering characteristics of a sensor, and the post-processing workflow. A photography-style prompt tells the model to make something that looks like a photo. A photorealistic prompt tells the model to simulate what a specific camera, lens, and lighting setup would produce in a real physical space. This distinction matters because AI models respond differently to each approach. Generic realistic produces good-enough results. Simulating a specific photographic setup produces images that professionals cannot easily distinguish from real photographs.
Skin, eyes, and human detail
Human subjects are where photorealism is hardest to achieve because viewers are evolutionarily wired to detect even minor anomalies in faces. For realistic skin rendering, specify natural skin texture with visible pores, subsurface scattering, peach fuzz, and realistic skin imperfections like moles and subtle discoloration. Avoid perfect skin which triggers the uncanny valley. Eyes need iris detail with realistic color variation, visible catchlight reflections matching your specified lighting setup, subtle blood vessels in the sclera, and accurate tear duct anatomy. Hair should have individual strand detail, realistic movement behavior, and proper light transmission at edges. Hands remain the most challenging element and benefit from explicit guidance: natural hand pose with anatomically correct finger proportions, relaxed gesture with visible knuckles and tendons. The more specific your anatomical direction, the fewer deformations appear.
Material rendering for products and objects
Photorealistic material rendering requires understanding how different surfaces interact with light. Metals are defined by their reflectivity: polished chrome has mirror reflections, brushed aluminum has anisotropic stretched highlights, and matte titanium has soft, diffused reflections. Glass has refraction, caustics, and Fresnel effect where edges become more reflective. Fabric has micro-fiber texture, drape behavior, and thread-level detail at close range. Liquids need surface tension, meniscus effects, and accurate refraction of objects behind them. Wood grain needs visible fiber direction, color variation, and appropriate surface finish from raw to lacquered. Include these material physics terms in your prompt: Fresnel reflections, anisotropic highlights, subsurface scattering, caustic light patterns, and specular roughness. Each term gives the model specific instructions about how light should behave on surfaces.
Environmental realism and atmospheric effects
Photorealistic environments need physically accurate atmospheric effects. Distance haze reduces contrast and shifts colors toward blue-gray for faraway objects, a phenomenon called atmospheric perspective. Specify this explicitly for landscapes and cityscapes. Volumetric light effects like god rays, light shafts through windows, and visible beams in dusty or foggy air need particle context: dust particles catching afternoon light, morning fog creating visible light shafts through trees. Water surfaces need wind-appropriate behavior: mirror-still lake reflecting surroundings versus choppy ocean with wind-blown spray. Clouds need depth and lighting: specify cloud type (cumulus, stratus, cirrus) and how sunlight passes through them. The small details that make environments feel photographed rather than rendered include lens artifacts: subtle chromatic aberration, natural vignetting, and depth-dependent sharpness falloff.
Camera simulation for the final 10 percent
The final layer of photorealism comes from simulating camera-specific artifacts that real photographs always have and perfect renders never do. Film grain adds organic noise that smooths out the uncanny digital perfection. Specify fine film grain for clean editorial or heavy ISO 3200 grain for moody documentary looks. Lens characteristics include subtle barrel or pincushion distortion, chromatic aberration at frame edges, and natural vignetting where corners darken slightly. Depth of field should have realistic bokeh characteristics: circular for most modern lenses, cat-eye shaped at frame edges, and slightly swirly for vintage lenses. Motion blur on moving elements grounds the image in photographic reality. Even adding scanned film negative border, slide film mount, or 35mm film rebate edges as contextual framing reinforces the photographic origin story of the image.