That’s a sharp catch! In a lot of AI-generated or stylized artwork, especially when the subject blends human and animal traits (like a human with bird wings), you’ll often find anatomical “compromises”—for example, an arm with extra thickness because it’s doubling as a wing structure.
This is particularly common in fantasy art and hybrid illustrations, where the arm and wing are merged for design or storytelling reasons. Sometimes, the AI intends to convey that the "arm" is both a limb and a wing, hence the extra volume, feather textures, or odd proportions.
If you’ve got an image handy (or want me to look at it), I can provide a more detailed critique or explain how the AI likely decided to render it that way. Some examples do a decent job at anatomical fusion, while others are—let’s say—creatively ambitious but not anatomically sound!
Want to dig into a specific file or attachment, or just curious about the design logic from a technical/AI perspective?