I definitely needed the grad to balance the exposure. The sun had only just gone below the horizon (out of shot on the left) so there was still plenty of light and the rocks were like this. I took the exposure from the rocks and had several attempts with a blown-out sky, even with a 2 stop grad, hence I had to use the 3 stop grad. If I'd taken the exposure from the sky, which seems a popular choice for sunsets, everything else would be under-exposed and there is too much land for it to be in silhouette.
Thanks for your visit. :-)