You might like to work in that resoultion and such, but for us to get an decent overall feeling of the picture i'd recomend an smaller resoultion, i couldnt even have a quater of the whole thing on my screen at once. Just a tip. :)
Its a good image, love the blood! Hehe. Though the strings of blood that hangs on his arm is unrealistic, blood isnt that sticky, it drips.
You need to study more anatomy still, even if you're better than most on it as it is.
Also, i think the background is bad. Really bad. Dont overdo it, the background is there to enchant the image you want to show, we're not even supposed to know its there. Make it duller, less contrasty and ligther.
Not a 10/10 maybe, but its some really nice work.