Rebelle 2 is a painting program that simulates paint and watercolor including water flow, tilt, water and paint bleed and more.
Unlike photoshop a lot of the mixing in the program simulates the true behaviour of paint on a Canvas. It is quite impressive and powerful. Watercolor painting is especially impressive.
Here are some of my drawings painted.
Colors in Rebelle2
WIP Colors in Rebelle2
Bonus Snail. :)