That was the previous sketch. Laying on the grave there was a sexy rotten chick being devoured by the zombies. The girl didn't work at all, so I deleted her from the drawing and instead of this I put a bunch of flesh and bones to emphasize the epitaph/wordplay of the tombstone: 'rest in pieces'. And standing behind the grave I also included another funny zombie sucking up a brain like it was a milkshake. Just to give the drawing more equilibrium. So the final result was that:
...Et voilà.
Drawing used by Maleficarium zine: