“Modeling with Millie” vol.1, #48, August 1966. Published by MALE Publishing Corp, 625 Madison Avenue, New York, NY. Marvel Comics. 12 cents per copy. Edited by Stan Lee. Art by Stan G. Story by Denny-O. Art by Artie Simek. Cover shows large 3/4 length view of Millie on left side and smaller cameo on lower right with a drawing of a portrait of a black woman and the words: “And… if you haven’t met saucy, sparkling Jill Jerold yet, you’re in for a treat!”
This was the second appearance of Jill Jerold, Marvel’s first ongoing Black woman character and her first appearance on the cover.
According to “True Love Comic Tales” website:
https://truelovecomicstales.blogspot.com/2013/02/jill-jerold-marvels-first-black-woman.html
Jill’s first appearance was in “Millie the Model” #141 (1966). She appeared in several issues and then disappeared from the publication.