Some very nice original postcard illustrations by Archie Gunn (1863-1930) are coming up for sale at Swann Auction Galleries’ June 5 illustration sale.  They are lots 86 to 89.

https://catalogue.swanngalleries.com/asp/searchresults.asp?pg=1&sale_no=2480&st=D&viewby=lot_asc&ps=200

See pulpartists.com for a good biography, https://www.pulpartists.com/Gunn.html>

Archie Gunn was a prolific illustrator.  See CardCow for more examples:

https://www.cardcow.com/search3.php?section=unsold&in_category=&s=archie+gunn

The originals watercolors are followed by the postcard reproductions:

Miss Canada, also known as Miss Toronto

Miss Chicago

Bride of Niagara

Rolling Skating Girl