I bought clear double sided sticky sheets in hopes of using the vellum for clouds. I STILL could not get the look I wanted. After giving it a test run (making sure it was on the page without artwork on the backside) I decided to pick off what I could and touch up the page with paint. I opted for opaque paper with brown inked edges for the replacement clouds.
It's not the look I wanted, but after exploring my options with adhering vellum, this is the final product. Moving on.