Honestly I would not even use that skin tone palette at all. Since the base color and shade seems to be limited. Since there seem to be a lot more off white skin tone options too.
( 
I black out all the off white options, Since the only use for the off white is camera light/sunlight option maybe)
This skin palette might be good for comics/webtoon since coloring is more simpler but not for illustration pieces.
Illustrations pieces usually depends more on the background colors to figure out what is the shade,base, and highlight of the skin color
Though factor in wise it depends on the art style too.
Iām not a expert in color theory/skin tone yet.
so I recommend watching so YouTube videos and reading some articles on skin tones/color theory.
Recommend this video
This option is a pay option but It seem like it has alot of good knowledge on skin/color theory.