a couple cars from the '20s with fashion couture paint design. Just how long would these remain looking this way before the paint was out of fashion?

this Delaunay Belleville was found on https://www.facebook.com/marc.tudeau?fref=nf

Sonia Dealunay was the designer of the above, with famed illustrator Georges Lepape, to showcase on the cover of the Jan 1925 Vogue the ‘Simultaneous’ dress, next to a ‘Simultaneous’ car, January 1925 and below. The above hood ornament appears to be Avoin Viosin, but the car below was a Citroen.

Most noteable and prestigiously, Sonia Delaunay was the first woman ever to have an exhibition at the Louvre during her lifetime.

http://www.artbeat123.com/marymac/sandr.html
http://onthisdayinfashion.com/?p=10256