My Review for Pony Diffusion XL:

Skilled in NSFW content
Offers various art styles
Specializes in adorable anime characters
Very proficient in furry, feet, almost every NSFW stuffs etc

1. Clip last layer

You usually won't have to change this setting, but make sure it stays at -2 to prevent the image from getting messed up. If you're not sure what that means, just keep it to -2.

2. Score Prompts

(It's really basic for Pony Series Checkpoints) When using PONY DIFFUSION, typing "score_9, score_8_up, score_7_up" towards the positive can usually enhance the overall quality. However, this effect may not be as noticeable in other models.

3. Add Compatible LoRAs

You can find a series of compatible LORAs on Civitai (Styles for Pony Diffusion V6 XL), add them to your workflow can hugely improve your result.

https://civitai.com/models/264290/styles-for-pony-diffusion-v6-xl-not-artists-styles

4. Embedding

I suggest trying out two embeddings. They enhance a little bit in some my results when refining facial, and finger features. Please choose based on your preference.

~~(aidxlv05_neg, unaestheticXL_Alb2)~~

Updated: I found a better embedding for Pony Diffusion, works mostly perfect

https://civitai.com/models/332646/pony-pdxl-negative-embeddings

5. Embedding

After many tests, now I use these negative prompts for almost every result:

low-res, bad anatomy, bad hands, text, error, missing fingers, extra digit, fewer digits, cropped, worst quality, low quality, normal quality, jpeg artifacts, signature, watermark, username, blurry, artist name,(deformed, distorted, disfigured:1.3), poorly drawn, bad anatomy, wrong anatomy, extra limb, missing limb, floating limbs, (mutated hands and fingers:1.4), disconnected limbs, mutation, mutated, ugly, disgusting, blurry, amputation