Hello mp5gosu,
I did render on resolution of 1337 x 1559 why was the same resolution as the reference image.
Regarding the render time I do not remember, but I left for 400 passes each image in HDCache mode.
Lighting I used the Corona Sun + Corona Sky
The setup I used was:
Exposure (EV): 2.0
Highlight compression: 10.0
White balance: 7500.0
Contrast: 1.5