Artstation - Beneath the Waves Challenge

This is my final entry for Artstation - Beneath the Waves Challenge, which was done after the concept from Hector Mateo Pino:
https://www.artstation.com/contests/beneath-the-waves/challenges/32/submissions/23073?sorting=popular
And here's thread to my challenge thread:
https://www.artstation.com/contests/beneath-the-waves/challenges/37/submissions