@gus_massa, True, I improved prompt (by asking ChatGPT to rewrite the prompt) and even models have improved in last 2-3 weeks. Unicorn was created recently with ChatGPT 5.2 while others are from older version.
Incase you are interested, this is the prompt for Unicorn. You can modify it for others.
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Create a printable children’s game sheet with a 3 rows × 5 columns grid of equal-sized square tiles, arranged neatly with clear spacing.
Background: pure white, clean, uncluttered, printer-friendly.
Art style: soft watercolor pastel, cute, kid-friendly, gentle colors, soft hand-drawn outlines, minimal detail, calm and cheerful.
Row 1 – Unicorn Horns only:
Spiral horn, Crystal horn, Golden horn, Rainbow horn, Star horn
Row 2 – Unicorn Bodies only:
White unicorn body, Pink unicorn body, Blue unicorn body, Purple unicorn body, Golden unicorn body
Row 3 – Unicorn Tails only:
Rainbow tail, Cloud tail, Fire tail, Starry tail, Flower tail
Each tile must contain only the specified part (no full unicorns).
Add a small, clear caption underneath each tile describing the item.
Ensure all tiles are perfect squares, aligned evenly, easy to cut, with no overlapping elements, no background scenes, and no extra decorations.