To add to what is already said, the nurse has a color fringing around the edges and the white boy's right shoulder drops too much. Also, his eyes do not line-up correctly. The right eye is a bit lower than the left.
The two boys together: The fingers at the bottom right don't make sense. No thumb and another weird finger on top of the four. Also, no biggie, but I'd remove the dimples/scar on the boy's chin.
The nurse/practitioner is a little tougher to figure out. The histogram says the dark areas can be opened up a bit. And maybe the shine on her forehead can be subdued? The eyebow on the left is a little softer than the one on the right. In fact, the right side from the bottom of the to the top of the forehead lacks the same degree of grain as the rest of the images, like perhaps this area was over processed. Just some guesses. Nice work overall, though, and probably fixable.
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