Hi,
I knew at what height was my camera when the picture was taken, so I set it up and then created the ground to fit the picture:
I didn’t strech it to the infinite as my working space will be in the foreground.The ground got a slight slope, so does my planes, and I added with a displace modifier in the field to recreate the grass tufts, I don’t know if it will be useful.
Cheers !