for clarification for EVERYONE.
Copy/paste--You hit command+c and command v. The parts are not modified.
Overbrush/Rebrush-You C/P, then brush over it. Sometimes reflections and parts are unchanged. Sometimes, another reference photo is used.
Brush From Scratch-brushed entirely, no reference photos.
Use the terms correctly and the thread won't be trashed. Obviously, in most cases, the artist will use a combination of all techniques.

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