Fixing Common Issues in AI Image Generation with Stable Diffusion (Artifacts, Hands, Faces & More)

Whether you’re generating a stunning fantasy scene or the perfect uncensored AI waifu, nothing kills the vibe faster than image artifacts — warped faces, broken hands, smudged skin, weird eyes, and all kinds of visual glitches.

Even with a strong model like SDXL, Pony Diffusion, or a spicy NSFW fine-tune, these issues still pop up. And if you’re new to AI image generation, they can be incredibly frustrating.

This guide breaks down:

• The most common types of image artifacts in Stable Diffusion
• What actually causes them (it’s not always your prompt)
• And most importantly — how to fix or avoid them entirely

Whether you’re using AI to create NSFW characters, stylized art, or your next AI waifu, this guide will help you get cleaner, sharper, and more polished results every time.

Common Causes of Image Artifacts in Stable Diffusion

Image artifacts usually happen when the model, the prompt, or the settings are slightly out of sync — and sometimes it’s a mix of all three. Here are the most common reasons your AI image might come out looking cursed:

Obscure Bug in A1111 with SDXL: Emphasis Mode

If you’re using AUTOMATIC1111 (A1111 WebUI) with SDXL, there’s a lesser-known bug that can cause broken or failed generations when using certain keyword combinations with emphasis formatting (like parentheses or weights).

This usually happens when:

• You stack multiple emphasized phrases (e.g., ((detail)), ((lighting:1.3)), ((expression)))
• You mix regular and weighted emphasis (e.g., (face), (smile:1.4), (background))

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How to Fix It

In A1111 WebUI, go to:

⚙️ Settings → Stable Diffusion → Emphasis Mode

Change it from Default to No norm

🧠 Pro Tip: You can search for a specific setting, look for keyword: “emphasis”

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Using the Wrong Resolution

• SD 1.5 works best around 512×512, 512×768, or similar
• SDXL prefers 1024×1024 and higher — using SD1.5-sized resolutions with SDXL leads to blurry, broken, or flat images
• Custom checkpoints sometimes have unique sweet spots — check the model page

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CFG Scale Set Too High

• Values above 10–12 can cause overbaked, distorted, or oversharpened results
• Faces especially suffer at high CFG
• Try 6–9 for better balance

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Overloading or Conflicting LoRAs

• Stacking too many LoRAs (or using strong weights like 1.5+) can cause visual chaos
• Incompatible LoRAs can “fight” each other — e.g., two conflicting body types or art styles
• Use fewer, lighter LoRAs and test combinations slowly

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Missing or Mismatched VAE

• Wrong or missing VAE can cause:
  • Washed out colors
  • Plastic-looking skin
  • Bad contrast or lighting
• Always check if the model recommends a specific VAE

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Low Sampling Steps (or Too Many)

• Too few steps = blurry or unfinished images
• Too many steps = over-refined, stiff, or “muddy” outputs
• Sweet spot is usually 20–40 steps, depending on the sampler

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Bad Sampler for Your Model

• Some samplers work better with certain models
  • Euler a = fast but often low detail
  • DPM++ 2M Karras = great for SDXL and realism
• Using the wrong sampler can cause weird structure, lighting, or shadows

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Clip Skip Not Set Correctly

• Some models (especially anime/NSFW ones) require Clip Skip 2
• Using the wrong value can lead to:
  • Low detail
  • Washed out results
  • Inconsistent prompt following

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Prompt Is Too Vague or Unbalanced

• If your prompt is missing key descriptors or doesn’t match the style you want, the model fills in the blanks — often badly
• Too much emphasis or missing guidance (like no background or lighting) can lead to strange results

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Plugins Not Enabled (ADetailer, ControlNet, etc.)

• Some issues (especially with faces and hands) need fixes at runtime, not just prompt tweaks
• Skipping tools like ADetailer or ControlNet for pose control can leave you with persistent artifact issues

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