well here we go:
step 1: see the light: desaturate the colors (because the colors can distract from the real lightness) and indicate where there is too much light (blue) and too little light (rose)
step 2: get the tonal range oke: apply levels: pull in black/white points a little. This image has been taken in full sun, lower the gamma somewhat
step 3: get the basis right: split channels and look for the most contrast (red and green mostly with portraits)
step 4: combine the information: I choose to add the darkest parts of the red channel to the green channel (calculations source1 =green channel, source 2=red channel, blending=multiply)
step 5: apply the light: dodge with a large soft brush the rose regions, burn the blue regions
step 6: make it work: add a little grain 5% gaussian, remove the color burn under his left eye
step 7: hold it together: burn the edges (new layer gradient fill using foreground to transparannt angle=90 another new layer this time angle = 0, merge down the gradiebnt layers, set blendmode to soft light opacity 20%)
et voila:
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