Use depth of field, try both simple and sprite. For simple you might want to try and remove the front blur (near values to 0) Play with max blur and far end values. Far start determines how many units from the focus point the back starts to blur and where it reached full blur. Same for near and front.

Use NVidia Dynamic Super Resolution and resolution scale. Place your shot in windowed mode 720p with resolution scale on and then go into full screen (alt-enter) and take the shot.

Look into tonemap, specifically the exposure (middle gray, min and max exposure). Set max exposure to something high, min exposure to 0, and then play with middle gray and try value between 0 and 1.

Use low FOV, <20 works for most I think

Also dunno if it makes much difference in your shots but shadowmap resolution can be increased on the misc page. Something like 8096 makes shadows really sharp.