B&W to color

[Christina Common]

I am currently working on a portrait of a deceased Air Force general. I was given very few pictures to work with, but I still want to produce a great portrait. I have only one color photo and the rest are black and white. I will attach the reference photo next. I would love any opinions to help me!! This is a quick color study I did - also to get me use to oil. I've never worked with oils before. I'm not fond of the smile, but the story behind this portrait is the wife of this individual dislikes the current painting that was made of him. She felt the current painting did not look like her husband, especially the eyes. She wanted everyone to know he was a very compassionate man who dedicated his whole life to medicine and the military. I had one B&W photo of him smiling, so I explored with that one.