Fekke, no worries about it being an old post. I'm quite sure that, as soon as I go back to switzerland, I will go flying again on this track, since it was lovely.
About your question....apart from the cleaning of the windows

, one of the idea could be of switching the autozoom of the camera off, since it risks to zoom on the window instead of the outside. try otherwise the small hole (how the hell is it called?!?) on the CPT window (if there is). My picture are never beautiful, to be honest, I do not really look for an artistical snap, but a souvenir of the flight. and actually, if inside remains something specific, as a part of the cockpit or the pitot's tube or part of the wing, I'm even happier!