Lack of visual hierarchy. Lots of use of bold text to make numbers stand out, without bolding the corresponding labels. Reliance on heavily-saturated primary colors. Limited attention paid to alignment.

LLMs in general are pretty terrible at spatial arrangement. You should see some of the architects' critiques of AI-generated floorplans that are on YouTube; the LLM generates a layout that is just nuts. I've found them largely useless at putting together UI mocks; Figma or Photoshop is still way easier to work with if you just want to cut up UI elements and rearrange them.