Workflow suggestions for drawing in Fresco and changing colors in Illustrator

I'm looking for suggestions on a workflow that will allow me to trace over my photograph in Fresco on the iPad and then bring it into Illustrator to add color and make revisions. I like the hand draws line quality of the vector lines in Fresco, but I've learned that they are actaully shapes. The Fresco vector tool is drawing a blog shape. But they "Look" like lines. So, once exported to Illutrator is there a way to join your vector shapes, such that it creates a third shape inside of the joined lines? Maybe using Pathfinder?