I am happy to report that I have found out in what issue of Cosmopolitan magazine that the make-up feature with Samantha Jones appears in.
It's in the August 1973 Cosmopolitan (with Naomi Sims on the cover). I just bought it from a Seller online and I am looking forward to receiving it. It's a four-page feature with two beautiful 'after' photos of Samantha Jones and very detailed photos of her make-up application. It sure makes for a great makeover story and is a classic example of just what make-up can do for a woman, when it's applied right - it's rather fascinating to see her transformation from a very plain-looking woman into this gorgeous model.