Hi Colin!
Thank you very much for your great comment!
Here are the steps I took with this image:
1) Apply Image to remove the stronger Cyan cast above the Lady's head:
Source : Green
Target : Red
Blending: Lighten
Opacity : 100%
2) To increase the tone, I created a Luminosity Mask (CTRL+ALT+~ , Feather Radius = 2 Pixels), (CTRL + J)copied it on its own Layer (Blending = Multiply, Opacity = 100%)
3) To reveal more details (even more tone), I created a Curves Adjustment Layer to decrease the Shadows and increase the Midtones.
(*see attachment)
4) Merged Visible.
5) The tone was now OK, but the colour was kind of 'muddy' so, I created a second Luminosity Mask (CTRL+ALT+~ , Feather Radius = 2 Pixels), (CTRL + J)copied it on its own Layer (Blending = Normal, Opacity = 100%) and, after pressing the
~ Key to view the full colour preview, I used the Levels on each separate Channel until I was satisfied with the colours.
6) Used Blur and Clone Tool to clean up the image.
7) Replaced the background with a soft Radial Gradient.
8) Created an empty Layer (Blending = Overlay) and with a fuzzy Black and White Brush (Opacity 5 - 10%) , I emphasized different parts of the picture.
9) Used the Custom Filter to sharpen the couple only.
