Nimue
Dark Lord
I think it would be strange if you described white characters in terms of marble or alabaster and then described brown characters as earth, but if it's not weirdly specific like that, and it makes sense in the eyes of a POV character who's a farmer or a nature-lover in that way, you'd probably be fine. Again, context is everything. And I meant that the imagery of other people present in the narration should fit with the associations of the POV character describing that, not that you need to describe a 1st person POV character in detail.
Also, if there's variety in your descriptions it'll help you avoid a pitfall like that. Even if most of the characters are brown, wouldn't you be describing a range of colors regardless? In a majority-white setting we still describe a range of skin-tones--peachy, pale, sallow, tan, etc--and obviously people of color have a million undertones and shades as well. No population is so homogenous that there are no variations in skin color, particularly with sun exposure taken into account.
Also, if there's variety in your descriptions it'll help you avoid a pitfall like that. Even if most of the characters are brown, wouldn't you be describing a range of colors regardless? In a majority-white setting we still describe a range of skin-tones--peachy, pale, sallow, tan, etc--and obviously people of color have a million undertones and shades as well. No population is so homogenous that there are no variations in skin color, particularly with sun exposure taken into account.
Mystagogue