Nordmen

Some roughs for a few little Viking fellows I'm sketching out for a possible children's book. They all have their own little personalities and motivations which I'm trying to get across in their design. Shape is an obvious one, but there's a few little details too that can be important. A character that's aggressive and mean will lean towards the sharper and larger end of the spectrum, but then how do you get across a tough and aggressive character who is one of the most good-natured of the good guys? It's a fun challenge to figure out!