You nailed the shape of the monster. I recognized it instantly. The water bothers me, though. The ripples ring around the monster in your version, yet in the actual version the ripples do not originate from the monster. This wouldn't be a big deal if it didn't make the water look flat. There doesn't seem to be any perspective on the surface. It's not a huge deal, just something to think about.
Want to give some dough back to all those amazing pixel artists? Donations provide prize money for contests, help cover hosting costs and support new initiatives.
</sarcasm>