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So, I ended up using a grid to assist with drawing, (still a valid traditional method) which required I actually practice drawing skills.
I still just usign a layer with a reference photo to redraw what I need but I feel it's realy teaching us nothing so using a method you are talking about is realy alternative and still a valid alternative. If you ever watched `Portrait painter of the year` then it becomes clear that more than half of the participants use this method, including experienced artists, and no one really bothers.
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unfortunately, the real experience of mixing oil paint colors, and its application to canvas simply cannot be replicated accurately in any current software available
I came to the same conclusion, but even considering this, you paint, you mix paints, and in the end you enjoy creativity.