It is a lot of zoomed in masking, I'm afraid.
First, add a Channel Mixer layer, check the "Monochrome" box, and enter 0/+100/0 for the values. This will make the whole photo black-and-white.
Add the Levels layer above it and clip it to the Channel Mixer layer. Enter these values:
Red channel: 0/0.60/230
Green channel: 0/0.70/230
Blue channel: 0/0.90/230
At this point, the whole photo is a blue tone. Click on the mask of the Channel Mixer layer, then Cmd I to invert it to black.
Start the painstaking masking. Make sure you do this.