For example look at this Orc.
I really only painted 2 layers of skin and the one black layer which is showing through. It will probably take you a little more time than simply washing your model, but the results are better.
Advanced Painting tips
There's roughly 3 types of wood, normal, light and dark wood.
Painting normal wood:
First paint the area black, then Paint over with a fairly dark brown. If the surface is wood-textured, You can simply apply brown-wash and drybrush a lighter color, and its done. If there's no structure on the surface, you take a darker brown and try to paint the texture of wood. Do this by simply painting squiggly lines on the surface. Then if you want excellent painting on it, you can try and paint the raised surfaces of the texture with a lighter brown, this isn't necessary, but enhances the overall look. Always do this on large surfaces.
Painting light wood:
Start with a white coat on the surface being painted. Then paint with a normal or light brown(depending on how light you want it). For wood-textured surfaces, thin up some brown-wash with a bit of water. Then simply apply this to the surface. All it needs now is a simple drybrush with a lighter color. For surfaces without texture, see "painting normal wood".
Painting Dark wood.
Start with a black undercoat. surfaces without texture, see "paining normal wood". For textured surfaces: Paint the whole thing with the darkest brown you have. Next, do a heavy drybrush with a lighter brown, this brown should be the color the wood will be. Then a lighter drybrush for highlights and its finished. You don't do washes, because they tend to be lighter than the dark brown. You can also start drybrushing from the black up, so it'll become even darker.
Making things look really rusty
NOTE: Do this only on large surfaces, because it ruins detail.
To do this you need some brown crayon(Chalky type crayon, the professional ones used for drawing). Take a knife and scrape away little pieces of the crayon. These little pieces can be kept in a small container, to avoid your working area of becoming a big mess. Then paint the area you want rusted in a dark metallic color (Silver, and then black-wash). Then paint a rusty brown color over it (no washes). And when the paint is still wet, sprinkle some of the crayon-powder over it. This creates a very rusty effect.
NOTE: I mean the flesh types of Orcs, Goblins, lizardmen and even Zombies and vampires. doesn't work very good on humans, and I don't recommend it on elves because they’ll look rotting (but being an orc-player I think that's the way elves should look, so go ahead :)
First thing is to paint the whole area black. Then paint the
raised area's the color you want the skin to be. There should be
lot's of black area's left, but try it a little until you get
what you like. After this there's only need of one coat of
highlighting to make a model look good, and only a few more to
make it look great.
For example look at this Orc.
I really only painted 2 layers of skin and the one black layer which is showing through. It will probably take you a little more time than simply washing your model, but the results are better.
