It's a nitpick, but the style of the hand/arm seems a lot more cartoony than the rest of the piece, so it clashes a bit. But that said the octopus, water and the effects are awesome, so this wins. :)

My god that is nice.

The color choices here are spot on. Nice work!

Yes, colors are superb.
I quite like the background as well.

Very interesting style!  Good use/choice of colors.

Ooh the colors are caressing my eyes! Plus I like tentacles a lot. The non-hentai tentacles, mind you.

Loving the palette.

Im liking the style very much.

wow. gorgeous work!

Instant-octopus! Very interesting, I like the colours very much

sympatický

Sweet picture!!
Good job portraying depth.