"Scales" Wrap color shading

I have done a few cross wraps and I'm wanting to do one of the fish scale looking wraps. I understand the +1 layout and such, but I cannot find any information on when I am supposed to switch to a new color. I was planning on starting it today and probably just change when I feel necessary. Does anyone have any tips on number of threads of each color or any kind of guideline? Thanks!
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