-Imma note you some color changes..cus you have 2 main colors..and its soooo cliche (not ugly..just repetious)
-IDK your tase fully..but its sorta empty
-The anime/cartoon feeling on the "tentacles" are reallllllllllly nice..would be coolwith the whole thing like that.
- the 2d that flows from the render is really cool
-You have more of a dark, underwater feeling processed through the color. I suggest White-to-blue/SPRINGGREEN
-The backround "could" consist of spring items..maybe a big flower in the middle.
-The whole thing anime woot lol
nice, silohuette-like effect! the back lighting is just right, the middle is just the right amount of complexity. i dont like the upper left tube-thing in particular though... but otherwise, i really like this. good job!