Very easy way to colour body:
First draw lineart then fill it with darkest skin coloor (color that will be in darkest places).
Next add brightest skin colour (but not white) using airbrusch or normal soft round brush with low opacity and flow (about 30)
In the end I added a little shining effect using dodge tool in highlights mode.
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No to po polsku

:
Lineart wypelniamy kolorem najciemniejszym nastepnie uzywajac airbruscha lub zwyklego pedzla okroglego o gladkich brzegach nanosimy (flow i opacity na okolo 30) miejsca jasniejsze na koniec dodajemy odblaski np dodge toolem (w wersji highlights) chociaz mozna tez bialym kolorkiem mozliwosci jest duzo.
Thank you so much - I'm not a natural artist, but I really want to learn, so thank you for this little tip
I think it looked better without dodge though. :c
argh...