Stephen, the sky colours are superb and the silhoette is nice. The exposure is perfect, but I'm afraid the focus or the movement (did you use a tripod?) spoilt it. If it was sharp it would be much better. I would definitely use a tripod at this shutter speed, especially at telephoto length of the lens you used. Even that aside, I think you could have composed it a little better too.Maybe moved a little to the right to include the tree on the right entirely and the hill on the left, and excluded the other shrub on the left, as it is not as attractive a subject as the other one.