What dwells below (driving me bonkers!)

[astrosim]

So, this is my latest piece, I did it for a weekly activity we have going on over at instagram under the #artistalliance hashtag (we are a bunch of people who take turns on coming up for the following weeks theme)
I'm trying to improve my atmosphere and getting away from my "just a portrait" stuff. What's bugging me is the lower part of the image, there's something about the perspective and the tentacles just look out of place.
Any comments/tips/paintovers and suggestions would be much appreciated! :)