Hi Brenda,
You seem to be comfortable with drawing from judging your fathers head.
It also looks as this is a combination of two references and that is why you will have to harmonize the two figures later, since the front figure will influence the back one with a shadow, depending on the light setting.
I would recommend that you choose a warm shadow color and cool highlights. That would indicate that they are positioned indoor, looking out.
You should consider to soften the edges that are in the darkest areas, like the shoulders of your farther and the back of his hair, Leaving only the front of the hair with highlights.
The front of his head should be cool highlighted and not yellow.
Looking forward to your progress.
Allan
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