For two years I was the lead retoucher on the US Postal Account. During that time, I not only created ad imagery, but also the imagery for the 32 page quarterly Philatelic catalog.
Here are samples from the cover art of a few of those catalogs.
Digital Composition, Illustration and Color work.
USPS catalog cover retouching example
USPS Advertising Work
One of standout retouching jobs I did for the monthly USPS ads.