No exaggerated or distorted facial features for Joker or Batman
No watermarks or signatures on the artwork
No poor anatomy or disproportionate body parts
No low resolution or grainy textures
No overly bright or washed-out lighting
No amateur or beginner-level art style
No unrealistic or surreal elements
No disconnected limbs or floating body parts
No blurry or poorly drawn details
No unfinished or draft-like appearance
No unrealistic or unrecognizable portrayal of Joker and Batman's costumes or appearances.