Instructions:
I said something about super-detailing, didn't I? This effect is extremely difficult to get if you haven't followed the other steps, and if you haven't got a pretty good idea of how hair 'works'. If you're having a rough time of it, please find some photos to study - it will really help... or just set a mirror up next to the computer (hard if you've got short hair, like I do, but even short hair is helpful).

The trick is to use a really small brush and first follow the flow of the hair with light pressure, and then swerve out from it and across the other strands. This is what really makes a difference, and also what takes painstakingly much time. It's not necessary, I give you that, but the end result is really nice. These separate strands should always be made on layers of their own and carefully treated before they're flattened down. The big upside of doing the strands on individual layers is that you can lock the layer and they paint and shade the individual strands to fit into their surrounding environment. Treat them the way you did those large sections of hair, with shading according to how they fall and where the light is.

The other great bit about them being in separate layers is that you can erase, smudge, blur, and adjust your happy hearts out until they look just the way you want them to. This all sounds really serious, but it's not. It's just serious and difficult until you get the hang of how to do them, then they're pretty quick work.

Common mistakes:
Making too many of these errant strands and ending up with static looking hair... making them too obvious or too starkly contrasting, which generally just looks dumb, or alternatively not adding a single wayward strand of hair into an entire hairstyle, and ending up with something akin to a brand new Barbie-doll style.