Gotta say I love the gradient you used. Composition looks great too, but I think if it had something, even something as simple as a bubble or dark sillouette on the left background I think it could balance things out.Some things I think you could improve on are the heads and foreground red object. The faces definitely could use some detail, and I don't know if this is supposed to be underwater or on ground, but either way there's ways to make them look more dead in either situation. If it's above ground, some flies or insects could work, and if it's underwater, the decay process is faster so some light blue or green splotches could add a nice touch. Also, it's confusing to see how the monster's mouth has blood on it, but the heads don't seem to have any on them (assuming that the monster ate the bodies and left the heads untouched).The last thing is that the thing in the bottom left is confusing. I think you could tone down the saturation, add some shades to let people know what it is, and blur it to prevent it from catching too much focus. Good job, keep it up