Olena,
You have a very charming scene here and I wish you luck with the completion of it.
I think that the trick is to separate the light from the shadows.
The girl is sitting on a porch, and partly in the shadow, so the light values on her shaded dress and skin will be darker than it appears on the painting.
I have manipulated your photo to make more simple masses of light and shade. Mostly concentrating on darkening the objects that are in the shadow.
It
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