Mainstream artists started to use pastels in preparatory work and sketches, here Charles Antoine Coypel’s dramatic portrait of Medea (c 1715). One of the most brilliant of this first wave of pastellists was Rosalba Carriera, whose work demonstrated that a good pastel painter could match the accomplishments of the best oil painters of the day. https://markethive.com/alidervash/blog/mainstreamartistsstartedtousepastelsinpreparatoryworkandsketches