Hey Matt, really like the heads and the anatomy. The mouths are very good with the simplification of the teeth that do not distract from the expression.
Your 3-point perspective is a cool idea with some nice lighting and great scale with the inclusion of the figures. Their are 2 points that stick out to me, the building on the left and the mask in the lower right.
-The left building looks like its falling over which I don't think is intentional in this piece, this might be due to it having correct perspective but falling too far out of the field of view so it starts to warp.
-The mask looks cool but I'm not too sure about the form, the foreground side looks rounder than the other side. If its supposed to be a even rounded mask then I think you would see less of the far side cheek bone.
(Due to the mask size and the second dome shape behind it that looks like its fallen, It might look cool having the mask sinking into the ground. Showing its had an impact into the ground would help reinforce a ruin. Currently it looks like it been carefully placed which might be intentional but its unclear if the image is a ruin falling apart or a site mid construction)
Looking forward to seeing your future work dude, keep it up!