Really, it is just layering washes of transparent color on your paper. The trick is in choosing your colors well because not all colors are equal in transparency.
I've haven't been too happy with the results that I get with my Koi paints and decided to focus on glazing for a while. I don't like doing charts, so I did a couple of paintings.
The first is inspired by Robert Burridge's pears. He works in acrylic, and I'm not attempting to emulate his style, but I love this little video he did, showing how easily negative space can become a focus. I'd been thinking about that for some reason, and decided to use negative space that way in my glazing exercise.