Behemoth color scheme

Hey, new 40k player here. These are my first painted models ever so bare with me here.

I'm working on increasing my behemoth fleet, but i have a hangup about colors. Any suggestions to help make the barbgaunt/future weapons stand out? The colors i used were corvus black, jokaero orange, mephiston red, screamer pink, wraithbone, lugganath orange, temple guard blue, carroburg crimson, and nuln oil (citadel brand).

Anyone have any experience making this fleet really come to life?