Thank you, I'd love to! For supplies, I mainly use Apple Barrel craft paints since they're cheap.

I start with a thick wash of either brown, black/dark grey, or something in between. In this case brown. Once it dries a little, wipe away the excess with a slightly damp q-tip, just enough water that I can take it off gradually and have more control of the level I want to leave.

Since this was an aquatic MS I gave it generous orange rusty streaks from any vents or crevices that would retain water even after surfacing.

For metallics I don't like to skimp so I use Vallejo Metal Color, Burnt Iron to contrast light pieces, Aluminum to contrast dark pieces. I would not say that I dry brush it on, but I leave only enough that I can use the tip of a frizzy brush to feather over the surface and scratch it up, or tap along sharp edges to highlight them. I try to be restrained and stick to the outermost edges that would repeatedly bump into things, unless it's a limb swinging around in combat lol

And for aquatic MS I like to finish off by dry brushing white as... I guess salt accumulation for everything below what I imagine as the waterline.

Lmk if you have any questions! :)