For a book cover they would need to be high resolution & taken basically at the same time of day under the same type of sunshine so the shadows match... that may be hard if the aren't both facing the same direction (N/S/E/W)!
BoB
That's a tall order, animal.
Echoing Tripper's sentiments... two images of the same size, perspective and light conditions can be worked together and be somewhat convincing... two images of different size, perspective and light conditions are a challenge beyond my abilities...
That said, I know somebody with amazing skills. He has a background in digital animation, 3D modelling and live action video service manuals for all kinds of applications, including military hardware. Anyhow, If you can provide a person like him with workable photographs, you'll get professional results worthy of your cover.
PM me if you like. It won't cost you an arm and a leg... the expert is my cousin and I'll put in a good word for you, if you're interested...
.
I'm beginning to think this may be something beyond what is feasible.
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