I've had a good nose. I'm not seeing evidence of two light sources. All terrain shadowing is in the direction of the visible star. Only the arch seems to cast contrarily. There aren't secondary shadows or other-side illumination on the hills to indicate a second lightsource higher up and to the left either. Any second-star illumination would have be as bright as the first star given the cast shadow is of equal darkness and very obvious.
As a last curio...
View attachment 9068
The arch shadow in part doesn't match the hill shadow.
I guess there could be a second light source causing the subtle darker shadow bumps throughout the image, but these dark blobs are too subtle to match the arch's full shadow. There should be at least three distinct areas of brightness - both sources occluded, maximum darkness; one occluded; and neither occluded, full brightness. We're only seeing two.