How to "bald" a guy

[Krikor]

You will always have the question of how realistic you want your end result to be. The quality of the images (High resolutions) is directly related to the final quality possible to obtain.

I leave some techniques in the links below, and I believe that the degree of difficulty is in the order of the first link (easier) for the third.
► https://youtu.be/Nu-S1HmOCgE
► https://youtu.be/zorVCcY120Y
► https://pixls.us/articles/color-curves-matching/

I confess I didn't have the patience, even so I gave it a quick try :-)