Hi Patricia,
My initial suggestion is that you will need more space around the heads.
Then I think that you could lower the light value on the boys head related to the girl. This would be to support the perspective in the motive as it is.
I think that the "drawing" in the reference is varied and OK. So you need to get the, almost missing tones in the light areas of the faces to come forward. This may not be easy, but try to anyway.
This for a start.
Allan
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