Why is realistic skin such an issue for models?
The internet is full of normal, candid photos of people with natural skin texture. Theres a subset of heavily retouched editorial or beauty photography with that smooth porcelain skin look, but that’s clearly a minority of all human images online. Most photos of people are just regular snapshots where skin looks like actual skin.
So why do image models, especially open source ones, struggle so much to generate realistic looking people out of the box? Why do they default to this plasticky, airbrushed, over-retouched aesthetic when that’s not what the majority of the training data actually looks like?
Its striking how hard it is for models to reproduce something as common and statistically ordinary as normal human skin without needing specialized prompting, LoRAs, finetunes, or upscalers. Natural skin texture should arguably be the baseline behavior, yet it very obviously isnt. Why?