Why do some prompts produce ultra-realistic skin texture while others look plastic? (same settings)

I’ve been experimenting with portrait generations in Stable Diffusion, and I keep running into an inconsistency I can’t fully figure out. Using nearly identical settings (same sampler, steps, CFG, and resolution), some outputs come out with very natural skin texture and lighting, while others look overly smooth or “plastic.” Here’s roughly what I’m working with: - Model: SDXL base (local) - Sampler: DPM++ 2M Karras - Steps: ~30 - CFG: 5-7 The main thing I’m adjusting is the prompt wording, especially around lighting, camera terms, and skin detail.