Ruediger, you're right: pinhole + lith is working very well! The sun behind a tree is one of my favourite compositional techniques, too. The pinkish highlights/brown mid-tones/green shadows are just right for this image.
What mixture did you use for the SE5? I also use it, but with Fomatone MG I get quite different colours from yours, and I haven't found a good way to control the colour yet.