I'm often asked what program/tools I use for shading/coloring. I'm not very good at making tutorial, but I made this little something and I hope it can help a bit to understand ^^
You need a tablet to use different pressures. It takes some practice to get used to the water brush first, but once mastered it's a very simple, quick and wonderful tool for painting.
oh you have to click the box that says 'advanced settings' at the bottom of each basic brush setting and check the box that says 'size' at the bottom of the advanced settings .