ReD, I would love to see how you are doing these.....they are very cool. Maybe a brief description or a few screenshots. If you don't hav the time or interet in doing so, I understand. But please keep this series going.
yes it was cropped & also sky featureless but still added a haze in the collage - sometimes you can rescue after or pretreat the import to reduce effects
A lot of trial & error - always save the originals & work on copies