Overall, I love your artwork. The whole thing reminds me of renaissance. The ambiance and the whole expression that you have in here is beautiful, and I don't know what more to say in a long critique if I obviously can't say something more.
I love your brushwork, the thing you did with the sky. The work done on the face, although lacks detail, doesn't compromise expression. What you did with the hands are beautiful especially the right one, and you haven't failed to express both grace and class in how you made them.
Work more on the details in the hands and face, and although striking colors will damage the kind of afternoon chivalry ambiance that you want to achieve, try to dive in and use vivid ones. Other than that I can't find anything wrong with your art as I love it overall, but you can improve the details in the face-- expressing the emotion (if there's any) that you really want to project.
I am not sure though if this is a morning or an afternoon scene, but because of the lack of sunset colors I could say that it is a morning scene. If not for the ochre-ish/sepia-ish atmosphere, I couldn't say that this was what I supposed beforehand. I have an eye but not much of the taste and hand of a traditional artist. And again, I love your work.