The reference photos look good and the drawing looks right (though I won't be able to tell about the details until you get farther along and post some closeups of how the faces are coming along.
I'll comment just on the faces for now.
The major issue I see with this piece so far is that you are missing the major value changes. The whole left side of the Dad's face is MUCH darker than anything on the light side. The same is true with the boy. The whole area in shadow should be much darker.
Squint, squint, squint at your reference all the time to see where the large masses of lights and darks are.
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