Much to my surprise this portrait called to me at the Wednesday Night Sketch at The Frick Collection. I gave her a peculiarly long right arm but Whew! this wore me out.

Sketched from direct observation. Color added later at home referring to photograph on the Frick website.
Gridded notebook and pencil/Pitt fine pen, photographed using iPad and then imported into Sketch Club for color (ArtRage used for texture only). iPad; New Trent Arcadia stylus.