In reality, these illustrations are not much bigger than a large-sized postage stamp (approximately 4cm) but they caught my eye nonetheless! They are the work of Polish-born artist Wojtek Siudmak, a regular contributor to Plexus―the French erotic art magazine which ran from April 1966 - July 1970. Several colourways and design variations of the illustrations were used as section heads in the news, reviews and events pages of the publication throughout 1968-1970. You can view some more examples in one of my previous posts here.
All images scanned by Sweet Jane from Plexus Issue No. 28 October 1969 & Plexus Issue No.25 June 1969. All illustrations by Wojtek Siudmak.