First (Head): Lacks the level of detail of the other two examples. A painting would also possibly be drawn from a reference, although I have no idea what even the style of painting you were referencing. The major distinction here is that the cheeks in the the second (painting) photo have mottling that suggests to me a better reference. The proportions also seem just a bit more exaggerated to me than the other two. The neck of the first one seems larger, and the shoulders have some asymmetry which is hard to interpret. It looks a bit as if her left shoulder is closer, but that doesn’t exactly fit with the posture of her face.
Second (Painting): Basically by comparison with the others. It feels intermediate in realisticness.
Third (photograph): This seems like the photograph to me because it captures more detail than I would hold in my mind’s eye, unlike the other two. In particular, crisp laugh lines and the detailed contrast of the eyes makes it feel like it had the most real-world reference. There is also the detail of the clothing, and I feel like most people wouldn’t draw that if they were drawing a face from their imagination. (That’s actually an argument for the first being painting and the second being head, though).
My guess is head, painting photograph.
First (Head): Lacks the level of detail of the other two examples. A painting would also possibly be drawn from a reference, although I have no idea what even the style of painting you were referencing. The major distinction here is that the cheeks in the the second (painting) photo have mottling that suggests to me a better reference. The proportions also seem just a bit more exaggerated to me than the other two. The neck of the first one seems larger, and the shoulders have some asymmetry which is hard to interpret. It looks a bit as if her left shoulder is closer, but that doesn’t exactly fit with the posture of her face.
Second (Painting): Basically by comparison with the others. It feels intermediate in realisticness.
Third (photograph): This seems like the photograph to me because it captures more detail than I would hold in my mind’s eye, unlike the other two. In particular, crisp laugh lines and the detailed contrast of the eyes makes it feel like it had the most real-world reference. There is also the detail of the clothing, and I feel like most people wouldn’t draw that if they were drawing a face from their imagination. (That’s actually an argument for the first being painting and the second being head, though).