The shape of the volcano looks a bit strange to me.
I appreciate the use of cobble slabs, makes the terraforming look smoother.
The walls inside of the cave in the volcano looks too rough.
And without even looking for them, I found a mistake in the map @ /tploc 612 73 -6001 You can see outside of the map, and I don't play SCBB and don't know if some kits have enderpearls, but if they do, this could ruin the map.
As
Trenly said, there is an overwhelming amount of water and lava that could very easily slow people down or kill them.
I like that you tried to incorporate heads into the build, but unfortunately the outcome wasn't so great. They're a bit badly placed in my opinion.
And although it adds some some more ground to the map, i'm not a fan of the tunnel systems inside the volcano (I only discovered them from doing //thru, people could really abuse these spots and camp.
So I am sorry to say, but this map has been declined.