Each of these characters has some aspect to there face that I have to remember.
Minnel's face is drawn the way I'd naturaly draw it, his clothes are always nice. Arlin's eyes are smaller and far apart, his mouth is small, his clothing is very simple, and he's the thinnest of the group. Dinnet has large eyes, her body is almost always tense. Ticci's face has all small features, she loves ponchos, and I messed it up here but she's meant to be the short one. Finally, Winale's mouth is wide, his eyes are far apart, and he's the widest in body out of them.

Oh right, Dinnet's mouth will almost always be drawn as a triangle.