This sounds like fun! I'm a 4th year Illustration major at the Academy of Art University. I excel in pen & ink, pencil, charcoal, watercolor, and acrylic paint. I'm highly skilled in Adobe Photoshop and Illustrator and I can work in a variety of styles, so I can tweak the art to match your vision exactly.
Also, since you want this to be a sort of partnership, I wasn't really sure what to put for the price estimation...