Like U I just start working with dd3 (since Christmas),
so yeah good looking map. With some layer effect it will be great.

But in my opinion, you should thicken your walls. Right now, with the size of the creature in the map, it looks like the necro build up 1-3'' think stone walls that can be broken with one or two good shots. Try to put a 1'+ thick wall instead.

Hope to see the result soon,
alucard.