My paintings are colorful.
This is one of the reasons I paint. The freedom to use color abundantly.
I have a quick-and obvious-paint tip: Change your water often.
I repeat: Change Your Water OFTEN!
My water is kept in recycled empty milk gallons beneath my work table. I have a gallon for fresh and a gallon for dirty water. Because I have to haul these gallons up stairs and back down, you might think I would be stingy with changing my water.
Not at all.
The muddiness created by sludgy water causes me to change my rinse bucket frequently. In fact, I have four different rinse containers on my work desk. I have one for blues, one for reds, one for yellows and a larger one for big brushes.
Muddy colors are the bane of my existence. I simply cannot abide them. Changing my rinse water often is just one way I keep my colors clear. This is obvious, but something I think painters often overlook while deep in creative mode. Do yourself and your work a huge favor: change your water.