Portrait of Wayne
 

This is a portrait I am currently working on. It is oil on canvas 24"x30". The background in the reference is still in the air. I had to correct some colors. The photo is slightly slanted to show the dimension.
Ciao.

My thoughts
 

This looks like a flash fill shot and these are difficult to paint. You are doing well however.

Three points:

Watch the value of the background compete with the hair.
The increased height of the hair changes the skull shape and the "likeness"
The lighting softens some of the facial wrinkles and these need to be recaptured somehow. Even the photo shows more hardness to the face.