No real secret. The background pics were taken this last winter on a foggy misty day that appeared perfect as a Battle of the Bulge pic. Try taking panaromic pics. Print them, place them behind your model and take pics of your work . Believe me when I say that I didn’t have to use Photoshop since the pics came out just the way I wanted them. Good luck.
I’m sorry to disappoint you Vasso. The zimmerit is AM from Cavalier. Its resin. I like it better than etch because its more flexible to work with. To each his own.