the heads are a crazy magician, a guy called scar a bigfig cyclops called muscle an old evil turaga a cyborg a creepy purple smiley guy an evil forest man torakh from a brickonicle fanfic a trained guard who owns a black belt at karate and a female based on roodaka
Ta Matoran
Top row: Takua, Jaller Kapura and Nuhrii
Bottom Row:Scars, Blacksmith, Keahi and a random female ta koro warrior
Critisism is often painful but I wouldn’t regret anything.
Just take it for what it is and improve what you make next.
At worst some folk just spent 2 seconds of their lives to tell you something that doesn’t matter but other times it provides useful insight that can make you into a better creator overall.
There’s a tool in MS Paint, a rounded-square option, like the circle option, which I believe would be more beneficial to the concept art, and more believable as minifig heads.
Furthermore, perhaps it might benefit us the viewers to see how some of these look with masks on? They being Matoran and that typically being the custom in this universe.
I do like a few of the concepts rendered here. In particular the tan-faced, red-eyed one at the bottom-right of the top photo. It’s more visually interesting above the others in my eyes, and I think with a little tweaking you could have a seriously nice character design there.