Hi, in this test have use a single blue background (blue-screen) in sted of the normal bagrounds.
I have rending then rending the project with best setings on the rending, daylight and 12 o clock on the casted skys, the result is image, blue_screen_1.png
The have I replaced the blue-screen with a normal photo taked some there in US on my holiday.
The result of this is image blue_screen_1.png and blue_screen_1.png, the diffrence between this is I have adjust the perspektive a little bit, on image 3.
Robert