These guys usually soar quite a bit higher and are hard to photograph, but a combination of the clouds and the closer proximity gave a halfway decent shot.
Nice capture of the wing feathers. Have you tried playing with your editor packages's histogram tool (especially if you have a RAW format image) to see if you can recover more of the colour of the bird? This scenario of dark bird against bright sky always sees me tweaking things, often resulting in over-exposing the sky, which I don't care about, to see more colour in the shadows of the bird (it's what I was doing in my recently posted "Kite Seeking Kompany").