First I clean up the figure, as usual. I like to sometimes switch out the weapons with PE weapons, add tape/foil slings and cut out the parts of the figures that aren't supposed to be molded there. For this figure, I did a little of that, however, I wanted to focus mainly on the painting. I cleaned up the figure a little, and then blue tacked it to a bottle cap, my modus operandi for figure painting.
Then I'll prime the figure. I sometimes don't, but I like how the ACU turns out after it's primed in light grey (it seems a little lighter when finished). I am used to priming stuff, because of my background with mainly model building.
Then I added the green grey layer as the base layer. This is the darkest layer. I always thin vallejo with water in a little tray that I put a drop or so of paint in at a time. Usually you can get the green grey layer done fairly quickly. I use a thick brush for this, just so it doesn't take too much time, and my detail brushes don't get unnecessary uses.
Next, I add the Stone Grey color. I use a smaller brush for this. The 10/0. I make small dots, vertical, and horizontal lines. Sometimes it ends up looking like I just blobbed it on, and that's fine, it's fixable, and we'll go back and fix it. I made a few XL blotches on this figure. It's crucial not to rush this part or the deck tan, because then it'll turn out sloppy. After finishing a major part of the body (one of the limbs, the torso, or helmet) I will usually clean my brush so paint doesn't dry in there, although it's bound to happen eventually.
Here's the picture of my "set up" (on top of a blue piece of paper for a more attractive background)
Then after that, I use the smallest brush I have (not sure where I got it, and I have NO IDEA what the brush size is. It's a model master brush, and it's killing me to know. It's smaller than a 10/0, but who knows, I'll stumble into more of them sooner or later). I use this brush for facial details (eyes, mouth and such) and also for the Deck Tan on the camo pattern. I'll also use this brush or the 10/0 for Desert-3 camo as well.
In a little bit (probably Sunday or Monday) I'll go through the equipment, then wash and dry brushing processes, but it's fairly simple.
HTH,
Austin