I looked at the art for quite a while, and aside form a spotlight suggested, it's really hard to pinpoint the source of lighting other than it's from above, faintly at 11 o'clock or so. So if I can't figure out the source of light, I can't say that the shadows are inaccurate.
I know it's a little dreamy and magical in tone, so I forgive any and all technical inaccuracies!
-g
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