When the stars are right, our undead gods will RISE from the sea to RAVEN & SLAY & DEVOUR THE SOULS of the POPULACE!!...
But seriously, it's good. Very contrasty, though...was that your intention? There aren't any middle values at all, which one would expect when looking at water in motion (& possibly at the limbs of a Lovecraftian demon-monster). Also the clouds in the background look heavy, as if they're made of concrete foam. Other than those drawbacks, it's quite good.
