The shadow areas don't have enough detail and highlights are blown out. This might be because the processing is quite harsh. If the processing were toned down a bit and kept to the basics I think we'd see more details and yet you'd still be able to keep the mood that you wanted to convey.
A beautiful image marred by a soft focus. The very dramatic sky and sun light on the copse is very effective. A little more time with properly choosing ISO, aperature and shutter speed would have made this a ribbon contender. A good entry into the challenge.