Advice on making a bottomless pit

Hi! So I am on to my second map, a cavern. Within the cavern I'd like a large bottomless pit. I've created two colored polygons and added some glow effects for illusion of depth, but it still doesn't look quite right. Can anyone offer advice on how to make the pit seem more ominous and deep?

Since PNG seems to be too big to upload: https://dl.dropboxusercontent.com/u/8732704/Mithralfast%20Caverns%20pit.PNG

Thanks!
jedius

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