I came across the Lyla Mev youtube channel and was exposed to the texture palette concept. Essentially, it's a way to see how your dry brushing is taking effect and allows the painter to better understand what's about to happen to their subject. In other words, you get to test drive a bit before committing to the final product.
To start, you'll need some sort of dish, plate, tub, cookie sheet, etc. to act as the base.
Then glue a ton of different things to the base. I went with stuff that is similar to what I paint. Mostly I used all of my left over sprue things that I've kept for years. The half-track was from a raffle I won a while back.
Once everything is glued on, I used a black primer as a base. I'd some some previous try brushing with a metallic white, so that's why you'll see the white high lights.

Dry brushing can most easily be accomplished with a big bushy soft dry-brush. I've got two different sets. One from Army Painter which does the job quite well and one set from Artis Opus. The Opus brushes are very nice; but, probably not worth the $118USD that they cost. The Army Painter brushes are much more reasonable at $23USD. If you don't have a purpose built brush, no worries, an old trash brush can be used if you cut the bristles to be dry-brush shaped-ish.

First step is to get some paint on your brush. I'm using Citadel Mephiston Red for this tutorial.
Initially I'll wipe off some of the paint on a paper towel.


As you can see, this is about what I use when I start to apply to a model. With the texture palette you can get it perfectly correct by using the texture to determine the perfect amount of paint on the brush.
Now you get a visual representation of how the paint is doing.

















