Viking Tattoo

Please bear with me, this is my first time critiquing something on here, and it's a little weird for me critiquing and artist who in my opinion, blows my work away, but here goes.

The first thing I notice is the great contrast, this is a piece that looks like it will heal nicely, and it seems to have a good silhouette, I think it would look good from a distance as well as up close.

The line work and shading are very smooth, crisp and clean.

The mouth area looks a little strange, the mustache portion doesn't seem to be very realistic, but it could be stylized. I think it could use a little more shading on the upper left side of the lower lip...I'm not sure why but that area looks unfinished to me. I'm a little wary of criticizing that too much, it might have been an intended effect.

The expression on his face is really interesting, it makes me wonder what the story behind the picture is.

The knotwork bordering the image looks awesome, really original, a creative twist on the usual stuff you see.

All in all an awesome piece, your work is a great inspiration.