Wow, this is sooo good mate I mean...
You can even feel the emptiness. I mean the emptiness inside you know.
It's just like one of those moments where everything is lost, without any music, sound or anything and after that short moment *flapp* - gone.

I can't describe how good this concept looks for me and I'm a frickin' poet dude! Won't you make a bloody poet speechless, will ya!? :D

So yeah, from the other point of view, nice concept art, the right tentacle on the top should need some redrawing it looks a tiny little pity bittle flat and the tentacles itself looks a bit to sharpy for a kraken. What I exactly mean is like, tentacles are going more flawing like...phew, have a look at this art as example http://www.goodkind.fi/kraken_705-344.jpg and look close at the tentacles. They go more with the flow of the underwater-waves. You know, they are going not like those.

Also I know what you did there with the mouth of the kraken huehuehue, H.P.Lovecraft reference incoming :3
Well if it should look more dangerous throw more teeth at it. The tiny ones. I know it's a shitload of work but it's worth it.

So for the light, the left big tooth you missed with the shadows a bit or I just can't see it right here cos it's almost damn midnight but ths is the only thing, maybe the tentacle in the back right you should overthink a bit with the light cos the tip of it looks pretty dark and well the light shines almost right on it if I saw that arrow right.

After all you did a great job and I look forward for more art from you mate.

4/5 Stars
Amazing, yet still some stuff to do.

Looks cool, can't wait to see what you do with it!