If you want to really help your friend don't give out his time for free: Especially if it's for a commissioned based business. Also honestly with something like

If you want to really help your friend don't give out his time for free: Especially if it's for a commissioned based business. Also honestly with something like that you're catering to fans who are super cheap, and your competition is every other 15 year old on deviantART. Add to that the fact that a generic graphic novel style won't even be popular. And if you want to see something really pathetic just go to a comic book and watch seasonsed pros do a little sketch for too little money. If your friend wants to do that, then he should focus on doing caricature sketches for kids parties for rich parents. But if that's the case your friend needs to realize that said gig isn't about art but entertainment -- and then focus on other things like the ability to make balloons in shapes and what not. Just so you know illustration is one of the harder ways to make a living as a creative person. There's a ton of competition, and thanks to stock images very little value. Your friend would be better off expanding his or her skill set outside being just a pair of hands (example: an art director will always make more than a storyboard artist).