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Go with another adjustment layer in that group, this time Black & White. Set it as shown below.
Here is a small issue, this adjustment (if set to soft light or overlay) causes a huge contrast differences, even though it's decreased to 69% opacity, it still makes the edges of the model look pretty bad. So go to Black & White layer mask, grab black brush and get rid of the dark edge (2nd image below).
Looking great! As final adjustment, create normal layer within that group, change its Blending Mode to Overlay, grab Brush Tool (B) again, use soft brush settings and paint with #8be7ff color, as indicated below.
Now create another group above the "woman adjustment" group, name it "background splashes". Hit Ctrl and left-click on woman layer's thumbnail to bring up her selection, then hit Ctrl+Shift+I to inverse selection and while having the group still selected click on Layer Mask icon.
If you're lost, refer to step 38. It's the same process of adding the mask, with the difference of using Selection Inverse.
Now after you add something to the "background splashes" group it will only affect the background without touching the model. So with that being said open the stain image and whatever way you will choose to extract it, it will be fine. It can be rough and inaccurate, the importance is to get rid od the surrounding white color. When you're done, just paste it in that group.
Hit Ctrl+I to Invert and change its Blending Mode to Screen. Use Ctrl+T to resize the stain. Place it somewhere among the smoke.
Next apply few adjustment layers to this stain, in the exact order as you see below. You can either use Clipping Masks or just go to Image > Adjustments and pick Levels, then Hue/Saturation, then Color Balance, and apply those settings.
When you applied everything correctly, you should receive the same result as in the 1st image below. There was no erasing done, those adjustments worked perfectly – they not only changed the color but also did a nice separation. To make this effect even more massive, duplicate this stain few times, use some rotations and place it along the smoke.