R.G. wrote:
You don't say what shutter speed you used, but with a monopod I would expect shutter speeds down to about 1/50 sec would be fine despite the 400mm zoom. The f-stop could have been a notch or two lower, giving a lower ISO, but the difference would be marginal. For the shot as shown I would recommend darkening it a little and maybe giving it a touch of contrast or clarity.
Sorry, I shot at 1/20. I have already touched up the shot as best I could in PP.