I tried to translate in colours for the bust, if I understand Eric ...
But also added some lightening on the hat (round above red but nit up to the top !,
and some light also on the left flat surface;
and light & dark on the red knot to give more structure...
and a white line at the edge of the reverse of the coat on her right, to separate sharply freom the hair
For the hair, do'nt hesitate to use black and white & light grey
But for the other one, the engraving ad face is so badly defined that it is hard for me to adjust. I woudl have flattened the whole face to a flat surface and painted like a canvas ...