Kate, love the pov here. And the light just hitting the edge of those clouds looks cool. Might be several ways to your question and not an expert on this. Yes bracketing several images might give more tone in that area. You could cheat and clone from the sky with a soft edge brush and lower the hardness and opacity. Also a little exposure compensation when taking the shot, along with changing the metering to say spot. My last effort would to look at layering in Photoshop and have a darker image and brush the area in question through. As I said a fine effort and I'm no expert.