Cavern Terrain

A friend has encouraged our gaming group to start playing Relicblade.  This is a fun game that plays on a 2' x 2' board and each player only has a handful of models.  So far, it has been a lot of fun.

The game has rules for different terrain types, so I thought I would try my hand at doing a cave board.  I thought about doing stalagmites and stalactites, but I was under a deadline and I wasn't sure my skills were up to it.  Instead I went with a more basic look.  I'm pleased with the results and only have a few more minor details I plan to add.

What do you think?  What did I miss?