Originally I was using the Exhumed/Powerslave one that has been seen in 1001 Doom mods, but I think it looks a bit goofy and too much designed to look scary.

(Over-sized pointy teeth etc - too much like a deep ocean angler fish or something.)
I'm looking for something a bit more realistic than that, but still with a vicious kind of look to it.
I have Frankensprited something based on this one:

I'm not sure where it came from (Castlevania?) and it's not bad but I can't really get it to look Doomy enough style-wise when I see it in game.
Here is my attempt:

The 2/8 and 4/6 angles could do with a bit of shortening - they look too much like the 3/7 angles. The pain sprites are probably a bit too subtle (just slightly rotated versions of swimming sprites).
When it dies, I just want it to disintegrate and disappear - which is why the death sequence looks like that. I do not need it to be in the Doom palette.
I darkened it because the original colours looked far too bright in game. This has helped, but It's still not right.
So, does anyone have anything better, or fancy tidying and Doomifying my attempt a bit more?