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I've posted the images side by side, reversed them and made them monochrome. I find that doing this helps me see in a new way and problems I was unaware of suddenly pop out.
The two major issues I see are, first, that the face in the painting is much wider. When I shrink that image horizontally, even a bit, it makes the likeness a lot closer, as you can see in the second pair of images. This distortion may have been been caused when you photographed the painting at something less than straight on, or it may be a problem in the likeness of the painting itself.
The second issue I see is one of serious over modeling. The areas in the light contain too many darks that are not present in the reference. The areas in shadow contain too many spots of light that are too bright.
Other than that I see some exaggerated waviness in the shapes of the upper and lower lips that is much more subtle in the photo. I also see that the jaw is too angular and the lower right edge (in these reversed images) should be more steeply slanted up to soften that shape. The asymmetry in the eyes is also exaggerated too much. Overly strong shadow forms on and around the nose also make it seem very harsh.
Hope that helps.
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