Jean Gabriel Domergue was born on March 4, 1889 in Bordeaux and studied at the École nationale supérieure des Beaux-Arts. He has been called th inventor of the pin-up. His elongated bodies have a manneristic flair. He exhibited at a young age and won the Second Prize of Rome at the Salon in 1913, and the First Prize in 1920. Here is a website dedicated to his work, and a different blog.
Jean-Gabriel Domergue, l'art et la mode (French Edition)
Lots more examples at the blog, older works here, a show girl here, portraits here, more portraits here, here, and here at Pin-up and Cartoon Girls.