High Five illustration Sky Transplant

I recently painted a cover illustration for Highlights for Children's High Five Magazine (May 2011 issue). The illustration featured kangaroos jumping rope, while a bunch of jumping mice engage in parallel play. I finished the oil painting, and I was about to take it to my photographer to convert it into a digital file, I noticed the sky on an old "Big Apple Barn" illustration of mine. I felt like I was lazy on the sky I painted for the kangaroos, so I had the Big Apple Barn illustration shot too, then I did a "sky transplant" in photoshop.