Half his face is dark, meaning that the source is from slightly behind his right ear, yet the shadow on her face obscures her features to a much lesser degree on the same side, although they should have the same shadow.
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Disagree. Look at it again. The reason the shadow is different is because her head is at a different angle. His face is directly toward the camera, so the shadow line runs down the center of his face. Her face is angled both down and toward him, resulting in a different-looking shadow . . . but if you compare the lines of the actual shadow, not where it falls on their faces, it seems to be the same.
Not saying this couldn’t be a Photoshop. I don’t know enough to say for certain. But take a look again and you’ll see that the shadows on their faces are *not* actually different.
I don’t see that.
Why can you see her right ear?
No matter where you move the light source, he should not be in that much shadow.