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I trust that you don't find my "green" picture too iconoclastic
Cezanne is reported (by Gauguin) to have said "A kilo of green is greener than half a kilo". By which he meant that large areas of a colour should be made less pure and less bright than smaller areas if they are to look similar to the eye. So, my preference would be for slightly less saturation in these pictures where one colour is dominant. Part of the reason it is hard to photograph the vivid colours we see is that they are partly due to effects the human visual system is subject to but the camera is not. The Purkinje effect is the observation that as light dims the peak sensitivity of the retina shifts towards the blue, so blues and greens look brighter than reds and yellows, which is why ferns in the dark hollows of forests always look vividly green. For the eye, increasing luminance increases perceived contrast (the Stevens effect) and colourfulness (the Hunt effect), and also affects perceived hue (the Bezold-Brucke effect) so that blues and reds become more vivid. This is why transmitted light has a special quality - as the people who put the stained glass in the Sainte Chapelle and the other medieval cathedrals knew; folk old enough to have looked at large format colour slides on a light table will also be familiar with the effect. This is also why sunlight transmitted through leaves overhead looks especially vividly green to us, but not the camera.
