Requirement 4

I used f7.1 to get this blurred background and set ISO to 2000 to let in more light, then set the exposure bias to -1 to keep the details of the tree easy to see. In Lightroom, I toned down highlights and contrast, then toned up shadows and whites to bring out the details of the tree. I also toned up the color vibrancy and saturation for a more pleasing look

Done