Took same image from where I stopped before, see BCM1904_ceheditsm, adding 2 hue/sat adjustment layers.

First layer, edited RED, slid Saturation toward left a little, only concerned at this point with their faces.
I also played with Lightness just smidge.

While still on the adjustment layer, set foreground/background colors to default with black being on the foreground.
Took the paintbrush tool, set it to very small brush, med hardness, 100% opacity, and zoomed image close.
Painted around Alexa's hair, Tyler's hands, lowered opacity and changed to soft brush to gently go over Alexa's cheeks and lips, bringing back a smidge of color.
Then I changed to larger brush, set opacity back to 100% and painted the rest of the sky.

I then did the same thing with the 2nd hue/sat adjustment layer, this time working with BLUE.
I again used the paintbrush to go gently around Tyler's hair, followed with larger brush going over the sky.