Wow... Oddly reminded of Star Wars: Episode One by looking at this. Regardless, this is very well done! Great job with the choice of colors, the murkiness use, as well as the creatures themselves. Very nice work here.
Sea monsters are just the best, aren't they? The ocean is so deep and so vast. There really anything that I can think of that would limit the size of a creature living in the ocean. Who knows what's down there?