Tempelhofer Feld Winter Black & White

Oooooh, I guess I made the most beautiful pinhole photo ever! Pure luck!
What is these grey irregularities in the sky? Is it finger prints? Dirt?
I am not sure … the piece of negative was in the Illy cam for some days before I actually exposed it. Maybe a change of warm and cold, maybe dust … I don’t care, it looks fantastic 😉