Generally, I like it.

Is the creature retreating into the floor or digging itself out?
I ask because the stone floor looks higher than the dirt floor and the dirt floor almost looks higher than the creature.
If the creature is breaking through the floor, then there should be stones piled at the edge of the hole and dirt bulging out of the hole and covering the stones.
The dirt texture should be looser rather than a dried mud crust.

If the creature is breaking in from another dimension, then a glow along the 'tear' might transition better between the stone and the dirt.

Overall, it is still a very good map.