Dark - Well done for getting a shot of the buzzard, nice sharpness on the bird considering the light and the fact it was moving, maybe a little less wall would have been good. Dirty boy is a good shot, like the detail in its coat and I like the choice of the horizon across the middle.
Power - wow, that's fantastic. Great angle you have got and a good shutter speed to keep some blur in the rotors but keep the pilots sharp. No crit on this from me.