With failing light, I abandoned the hides and continued drawing at home. I found I had omitted to put an SD card in my camera, so worked instead from photographs taken earlier in the year with more abundant foliage in the background.
This younger bird, again crouching among the undergrowth, does not share the appearance of sleek menace with the adults.
To finish this post, a field sketch again. I had a minute or two to draw this adult as it stalked the undergrowth. Moments later it made a kill and disappeared soon after.