Re: new edit
My idea here is to give you a guide to work with to help you bring in your mid greys as accurately as possible - like the rocks in this image - to their true color and/or tone. In so doing, you will keep your other tones accurate - or at least they should be - and give you - I hope - a good tonal range through the image.
This procedure is done right from the start - when you first open an image into your art program from the cam. All the notes on this idea are in the thread SQUEEZE BOX PLAYER in this PORTRAIT section.
By bringing in the color a bit at a time, maybe a softer or brighter skin color or other areas of the image may or may not be what is right for the image. This is a person's own choice here.
I like to have control of my tonal range - I am TERRIBLE at eyeballing an image - especially if I am doing an enlargement of any size.
I hope this helps.
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