I'll submit to the challenge if you remove the black, which isn't in the palette. Resubmit once you remove the black.

Edit: the image still contains pure black - check here

I made a surface to make it look more like water

 sorry for writing in another language... and i agree with anymattar and robinhood.

hey robinhood how did you change your username from therobinhood to robinhood

besides the bubbles and perhaps the colours it is quite above-watter like.

Bubbles are really the only hint that its underwater.  If not for them, It'd look like a regulr land level.  Sky looks pretty emtpy too, and you're resorting to banding again.  wtf comment below D:

 jag har också gjort en mockup till underwater level. den kom in. emanuel har härmat mig med bilden men han har inte lagt upp sin än.