This example may make it easier to see what I mean. Using the eyedropper tool in Photoshop, I grabbed a sample of the values from the lower left and the upper right areas of each baby's face.
In the photo reference you can see that there is a huge difference in the value of those major head areas. In the painting, the value is almost the same when comparing the upper right to the lower left of the head.
Photoshop is a great tool for clarifying and checking this sort of thing, but if you squint, the difference is also quite apparent.
Hope this helps!
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