Negative prompts tell the model what to exclude from the generation. In PicX Studio's prompt interface, there is a dedicated 'Negative Prompt' field. Enter elements you want to avoid: 'blurry, low quality, distorted, watermark, text, extra limbs, bad anatomy, oversaturated.' Negative prompts are most effective for removing common AI artifacts. For example, if faces look distorted, add 'deformed face, asymmetrical eyes, bad teeth' to negatives. Keep negative prompts concise and specific.