Just noticed something: Why does everyone always make three vikings? Usually with one red being the leader.
We have it here, Kenneth has 'em, and I've seen it elsewhere several times before. Remains of Lost Vikings? They certainly added to make a viking stereotype, though the red guy is most likely the result of the only really international viking I guess. Erik the Red. Never mind, just thinking out loud.
Looks good so far, a few things to mention:
Like it's been said, the oars on viking boats came out though the hull itself, not on top. This only works on small boats because their edge is so close to the water. If you were to try and move a boat forward with an oar placed several meters above the water, it would hardly move at all and you would use most your energy just moving the oar itself rather than watermass. Of course, your boat isn't very large, the edges are still too tall for it to use oars this way and in any case the shields would get in the way

Making the oar come through the side would make perfect sense since you've allready got your rower in the perfect position for it. (Though usually, slaves did the rowing on larger ships, we can say it's not big enough for that.)
Next, the waves on the sides really don't work that well the way they are now. Judging from the way you've made the water around the octopus, I would think that a single, wavy line would work better, but I can't say for sure unless I see it for myself.
Lastly, the outline needs some smoothing. I'm a bit puzzled about how the Kraken only has outlines at it's edges while the vikings and some of the boat has it everywhere.
I'll leave you to it then. Looks good so far.
