No I don't think you want a spotlight. Look at the photo. Do you see any shadows anywhere? I don't. It looks like an overcast day. You have not shown me the whole panorama so i can't be sure, but it looks like there are poles or something on the left and they cast no shadows.

This is a case where you should only have contact shadows, not directional shadows. Contact shadows can be calculated using AO. My new shadow catcher will do those for you.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)