I think a lot of the technical changes you plan for here sound really sensible.
Intending for this to be helpful feedback rather than criticism, however, personally I have a couple of issues with the colour grade which you might want to look into. Firstly, to me, your grading looks like it’s putting a brown/grey filter over everything, which I think is detrimental. Secondly, I think the filter is particularly affecting your human fleshtones, which I think look quite pallid, giving the characters pale skin and pinkness around the eyes.
As I say - not intending to criticise your work at all, merely offering that up in case it helps you tweak to achieve your desired effect.