Wow, great design here! The line is very simple and essential, but the shading gives them strength. Also, their poses kinda reflect everyone's own... "essence". I mean, Pohatu and Onua are both bold and strong, Lewa is the most dynamic of them, Tahu is the hot-headed yet expert leader, Gali is the authoritative female hero, Kopaka is the fierce warrior. Their main traits are here caught in the way they face us, as I see it, and I love that. Yes, I think you've really reached your objective.