I don't actually do finalized character concepts, I draw a rough sketch of the character to give me a general idea of their design and then just draw them straight in the comic. This leads to me adjusting the designs as I go because what looks good in a singular concept might not work so well in comic pages.
Does this lead to inconsistencies? Sure. I like to call it "evolution" though.
Your artwork looks amazing, you sure put a lot of effort into them.