I did put them through pro/dev as well just to be safe. The quality changes and you can play with guidance (cranking it all the way to 10) but it doesn't make a significant difference for these prompts from what I could tell.
Several iterations and these were the best I got out of schnell, dev and pro respectively for the following prompt:
"a fantasy creature with the body of a dragon and a beachball for a head, hybrid, best quality, shadows and lighting, fantasy illustration muted"
Several iterations and these were the best I got out of schnell, dev and pro respectively for the following prompt:
"a fantasy creature with the body of a dragon and a beachball for a head, hybrid, best quality, shadows and lighting, fantasy illustration muted"
https://gondolaprime.pw/pictures/schnell-dev-pro.jpg