Rebelle is around $100 and is a unique program that really shines when it comes to realistic water color.
Rebelle is around $100 and is a unique program that really shines when it comes to realistic water color. Besides many other features, you can tilt your painting to make the paint drip in any direction you like, or turn tilt off to paint your watercolor on a "flat" surface; you can "blow" on your wet paint to move it across the page--like using a straw to blow on your real-life watercolor; you can pick from a variety of watercolor papers (or canvases for the other paint tools) that all interact differently with the paint; you can wet your paper all over or in any specific area you like, paint on it, then dry it when you're ready, or just paint on dry. This makes for some pretty realistic watercolor!). There's a variety of other traditional tools and you can customize them to your heart's content and import tools. This program has features available that help people in the industry with rendering realistic flames and some other add-ons I can't remember. I haven't used any of those so I can't speak to that.