thank you for your very kind and positive critique, and for looking that closely into the image. "Surprised to see the tongue shadow not completly closed" - so am I, now that you told me. But this is what it is - not a bug that came in by some kind of postwork treatment, but a fact that is to be seen in the untreated orginal full size data as well. Must be a some kind of tiny dry plant fibre sticking out of the mud just in front of the shadow, and covering part of it.
Thanks again, and my best regards,