@VooDooMedic the screaming expression gives the impression of a heavy metal song with screaming vocals, which is misleading and offputting. I would make a more pleasant thumbnail to make a better first impression.

@Tfmonkey @VooDooMedic I like the screaming version fine, but here's something you could consider if you take TFM's advice.

"Siren" is also often used to describe mermaids as a sub-category of Siren.

You might try that in your prompt instead of "siren" if the a.i. is forcing the self-imposed rules for a screaming face.

If it's not as important to you that you depict the original winged-bird version of sirens, this might give you some neat results you hadn't expected.