On your computer open the digital art software and the screen capturing software.
Open a new file in the digital art software and set up the canvas on which you'll paint your digital picture. You want to have an idea of what you're going to paint and be able to visualize yourself painting it.
Go to the screen capture software and start it.
Switch back to the canvas and paint your painting without stopping.
When you've finished making the painting, stop the screen capture program and save the movie.
Use a simple video editor such as iMovie or Windows Movie Maker to import your new movie and double its speed. Export the movie and it's done. You can put it on YouTube and from there embed it on your own personal website or email it to others.