Thanks for the positive comments, guys! As I said, this was literally done over coffee and I didn't expect such feedback. Basically what I did was look for a large suitable pic of a landscape, and just pasted it on top of the original camo. After that, I did the same thing for the engine.
Having had "proof of concept", I was wondering about the "warping" part (spot on, Jarink!). After having tested it, I erased the layer in question, so I can't show any close-ups. But I'll work on it again later (I have a few further ideas I have to test) and post when ready.
The pictures you uploaded are useful indeed Ugo, and I'll save them for future reference. Thanks! I'll also consider opening up the cowling.
The only downside is that I generally don't do aircraft that are so highly polished. However, it has became a question of pride: a challenge to be solved.