Great jorb!
Is the pice finished yet? What is the column made from?
If possible, the column would look good with some fluted patters like a greek/roman column. Right now it looks too smooth.
Also, another way to add some encrusting detail would be to add some glue to the column, and sprinkle on some plaster. You will need to mist the plaster lightly a few times as well, but once the glue dries and the plaster cures, it will leave some nice encrusted stuff that looks like sealife. You can find some pictures of what I mean in a piece I did for my deepwars terrain:
http://mylifeinmm.blogspot.ca/2013/01/deepwars-ruins-update.htmlKeep us posted, it should look ace with some paint!