Looks like she also has Olivia's artwork up for sale as well, and Olivia offers a licensing agreement for 10 whole bucks, to use her art. I don't get these people. I honestly don't.
I know she's not using a licensing agreement because she doesn't have it posted, which is pretty much all they ask.
Here's her package plans. You can get the images to this package, tubes, plus close-up's for 30 dollars and your granted a limited licensing agreement. It's not a strict one either.
http://www.creativeimagelicensing.com/a-n-p/o/olivia/oliviapackagea.shtmlOh and PS you can get a lot of great artists licensing agreements at this site.