If ochre and white gives you a good starting point, you can add a little blue or green (Very little!) to desaturate the color a bit so he doesn't like "glow". No black! Black not only darkens but also kills off the paint.

Add a touch of red to that base mix to see what you get (a smidgeon, the tiniest of touches).

I'd go yellow ochre + a little bit red, then white. A bit more white for highlights (and a tiny bit yellow because the sun is yellow), less white for darker skin. Now you have dark, midtone and highlight. Add a little bit blue to the midtone to make a shadow color (because tje sun isn't in tje shadows but the sky might, and it's blue). Or test green, kills off the red in the skin very well.

But you can get away with less of course, or more, mixing colors is fun!