That certainly looks like a duck Pop it some more in the post maybe? Push some whites or local curves where the duck form is located? It is a haunting image once you see the shape.
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Some trails with GF30. 63x1min stack at ISO400. Fully charged battery died out after 63 exposures at ambient temp of -19C.
Thanks! I don't know what to do when the ice melts away. Maybe switch to Ultraviolet landscaping with my full-spectrum K-1 as I just got proper UV bandpass filter form Kolari. It's funny actually...I remember when I bought my first DSLR ages ago and the shopkeeper insisted that I buy a UV-filter with the kit because it's so super useful. Now I finally bought an UV-filter which only let's the UV spectrum though