Unfinished study of an Old Master

His name is:

William Bouguereau (1825-1905) and it is titled:

"Portrait de Gabriel Cot"

Some studies from the Old Masters (varied styles....click on to enlarge)

Original Old Masters names have been forgotten I'm afraid.
But will try to chase them up.

A  study from :Perrault_Leon_Jean_Basile_Le_Miroir_De_La_Nature

This is a study from a Russian artist whose name I will eventually find.

This is a study from an early Monet