It's a tough photo to work from since the exposure for her face is off. The shot is perfectly exposed for the horse and I imagine that's one reason why it was easier to paint. This is a great example of why it's best to get several bracketed exposures to paint from. This exposure gave you skin tones that are much too light and too magenta and so you've had to invent which is very, very difficult to do.
There are also some issues with the roundness of the form of the head and with her expression. Since you aren't planning to do any more work on this painting I won't go into detail here, but she looks much happier in the photo than in the painting. Also, the photo shows a much greater range of light to dark from one side of the head to the other whereas the painting makes it much flatter and has lost the three-dimensionality of the form.
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