Hey guys,
Managed to get a bit of it done tonight! Just kinda exploring and figuring out what I want to go with. I am I changed it's head area to a more crustacean shell kind of thing. I also added some reds and oranges to contrast with the overall blue/green theme of the piece. Lotsa refining to do.
@Didzis - Really digging the perspective you've got going with this piece. Really shows off the scale of the creature (although if possible, it might be be a good idea to either put the sub slightly in front of it, or another sub behind it (but a bit visible) to show the creature is larger than it. Really cool design too. Reminds me a bit of mosasaurs (sp).
@ Machuna - I like the odd design going on here. The flippers are particularly cool and I am also digging the painterly, loose brush strikes you've got going on. I would say the creature might be too crisp/clear if it's underwater. The shadows are very dark, I'd add in a bit lighter/deeper blue and maybe even a blue layer over top with a very slight transparency?
@GriffGraph - Some of your first sketches remind me of bacteria or viruses. It would be a neat concept that a bunch of these creatures make the bloop when mating, like the whole part of the sea turns whatever color they are and they collectively make one massive noice. That having been said, I am liking what you have so far. A turte/stingray mish-mash could look pretty sweet.
Hopefully the feedback is helpful!