When I paint pages or cloth I like to return to them several times to layer in some more colors and unite them with a color wash. Usually, I use paints that are progressively more diluted- so the colors beneath them are still seen. If you think in fabric terms, in a way, I’m creating more solids.
I pour a small amount of paint right onto my table. I’m working on a sheet of 4 ml plastic. I paint with an old credit card. This allows me to scoop up the paint and scrap it onto my paper, pulling the card around, changing the angle and even using the side to create lines.
You can also blot excess paint away with a paper towel. Rub or simply press & lift. This creates another texture too- where the paint is removed the lower layer is revealed. Sometimes, I’ll spray the paint to remoisten it to allow more lift.