By request
Here's a Mermaid mod that removes the rock she is sitting on and the floating skulls.
All particles effects are removed as well when inspecting the demon. In combat, there's a little puddle of water still present. If any modder knows how to remove that as well, I'd be really curious to know.
I also made the same version with no palmed hands, because why not. (No specific screenshot for this version, but I think you can figure it out).