I appreciate that!

On drakes I use goose grey over almond. On hens I like a mix of feather brown and goose grey that I call “dirty head” over almond.

On hen black ducks its actually yellow. I like createx wicked golden yellow. The trick is to prime with self etch primer which is grey, then lightly over-spray the yellow which will give you that kinda olive green/yellow color. If you get heavy handed with it, you can overspray some flat black and wipe it as soon as you spray it. That will fill in the low spots with black as well which is a great trick to use on other species as well like bluebills and pintails. Works well on mallard drakes as well. For the drakes, use the same color just more of it to get that more intense yellow. On hen mallards, which might be the question you actually had; I use a white primer generally (zinnzer bulleye all surface) and a Golden's acrylic paint called Pyrole Orange.

Thinned Rustoleum for the most part. Some of the pearlized paints are createx. For some colors I will use golden acrylics too.

What do you use to thin the oil based paint?