So you want to do cool graphic art?
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Look what I did. (Hey dude! Look to the right) I did this using a software program called Daz3D. It's relatively easy to use, and can get really expensive (thousands of dollars) however this is one of the most powerful programs I have ever seen. With daz3D you can make cartoons, comics, graphic novels, games, books, art, logos, T-Shirt graphics and on and on. Plus it is frustratingly relaxing.
Want to make money from it? Use it to make posters, books, have people pay you to make their book covers, games, cartoons, you figure it out.
There are lots of graphics programs, like Vue, Poser, Maya etc. so if you want to know more about the others, then google them.