These are clean up studies for Frank Thomas' character of Lady Tremaine in Cinderella. I don't know who the artist is, but these poses (except her head turn) are based on Frank's brilliant animation.
A difficult character to animate, and equally difficult to clean up, because of realistic subtleties involved. When Walt asked Frank to take on this assignment, he thought: Poor me! But the more he got involved with her personality and her voice recordings by Eleanor Audley, the more he understood just how much to underplay her movements in order to get a very powerful performance. One of Disney's best villains.