Working on a cave for an Ettin

this is the basic layout.

I'm having issues with showing height on the walls. Right now the walls have a smooth outer bevel down at a depth of 500 with a size of 15 and a softness of 11 and and outer glow and standard drop shadow. I tried doing the bevel up, but it looks like the ground is above the wall when I do that.

Sun in this case is coming in from the south western area of the map.

It might look better if i add some of my own shadow, which I'll try a little later.

Click image for larger version. 

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