Very cool. I would think about adding something to make the eyes stand out. A highlight of some sort maybe. It's a portrait and portraits with eyes that stand out are usually better for it. Just a thought.
Oh, don't know. It's an interesting take to leave him beardless. Sword looks good, but I guess it depends on whether your were trying to achieve a more fantasy based blade or a grittier piece of iron. It's good work! I like it.
Someone shared your work here on a Facebook page . I will be the guy crediting your work there for you. Someone there also asked if there was full body image of your awesome viking and I was curious too? So I did an image search to find you. -Ray B