Thanks to everyone for responding.
I missed a good opportunity to retake the photograph today when the sun was shining brightly. When I took this, the sky was bright but mostly overcast, and I think I lost a good deal of contrast. Richard's initial comments made me take another look and there are deeper darks than are apparent in this photo. Also there is some glare in the shadow area - I was using alizarin crimson+sap green in the darkest areas and it is a bit shiny. I'll give it another try as soon as I can.
Chris, that's an excellent suggestion about isolating one sharpest edge.
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