You haven't disclosed any info as to the intention of this peice so I'll crit what I see - a viking dude on a throne.
First of all, there's just nothing kingly about this guy. He's lookin' more like a peasant exhausted from tendin' the flock since sun-up. No clues of royalty or power or prestige or sovereignty. No indication of "viking" either, you've acheived a medieval look at best. His posture and attitude is a little awkward, seems to imply a deficiency more than kingly authority. I love Randommonkies' suggestion for him to rest on a balled up fist, not open palm, and even had the same thought - this'll give a better tough guy impression. Beard is flat, consisting of a strange monotonously rendered treebark texture. Axe is dreadfully commonplace, give him a unique epic weapon forged by monsters embued with runes decorated with silver and gold guilding . . .
**EDIT - while writing this you posted and expressed you're trying to create a lazy viking veteran type. So, I think our points of view differ. When pondering vikings, I like to imagine the glamorized cartoonized extremely tough feral warrior characters that wield huge battle axes and clubs and have leatherbound braids of filthy hair flying out from under ridiculous bull horned iron helmets, etc. and this is what compels my crit, so I'll just leave what I've written where it stands. Hopefully ya find something useful.