I had thought Drow coloration was intended to be a palette swap of High Elves. (I based this upon how they were described in the 3rd Edition books.)
Note: Some of what follows includes descriptions which are stereotypical in nature. I am not in any way endorsing said stereotypes. My intent is to use language which I'm guessing may have fit the mentality of how a creature (or characters) were drawn during a different era.
However, there exists (older) D&D artwork which does not illustrate them as described, instead choosing to incorporate some African-American features. I have no evidence to back this up, but -if I had to guess- I think that a lot of Drow women were stand-ins for the stereotype of a "strong powerful black woman," and it was an exploration of some artist's fantasy to think about being dominated by a strong woman.
Here is an example.
Drow are (in fluff) described as something of a perversion of "normal" (for a lack of better words) society, so, through the lens of an older American culture, the idea of a domineering, voluptuous, and dark-skinned woman ruling over males would have been counter-culture to the "norm" of a light-skinned ("white") male, at the head of the household, and with his lithe and dainty housewife. I believe there is some evidence of this found in looking at what the beauty ideals of that period of time were, and by looking at what were considered the traits of a "good woman" of the time. There is historical evidence to show that beauty norms were often constructed in such a way that African-American women were allowed to be viewed as sexual objects, but they were not allowed to fit into the categories associated (at those times) with being pure, womanly -or whatever buzzword was used at the time. I have no evidence at all to suggest this had anything to do with why an artist decided to start incorporating (what could be seen as) African-American features into the dominatrix look of D&D Drow matriarchs, but that's my random guess at what might be a motivation (based upon having casually studied the subject and having some anecdotal experience with a mixed family).
(Though, there could be some argument that the picture was loosely based on Tina Turner's character from Mad Max; that can be seen here.)
I'm inclined to believe there is less of a problem when Drow are portray as illustrated
here.
Though, that too leads to problems because it leads to the idea that the majority of D&D creatures have European features. What is the answer to having more diverse features but also being against certain features being used in artwork? Is it better for a product to ask for an art direction which is wholly alien from the features seen around us in day-to-day life? I'm not asking these questions to be funny or dismissive.
I'm genuinely curious because most of these discussions have a tendency to point out what is "wrong," without offering much of a solution for how to build a game/product in a way which corrects the problems -and does so in a way which still produces a product recognizable enough for an audience to connect with. I believe that most successful fantasy -even if it's some completely gonzo fantasy- still has some underlying human element (whether that be in emotion, look, tone, or whatever) upon which to build and with which to bring in an audience.
Another interesting question which arises is whether or not diversity includes inclusivity in being villains.
Obviously an entire race/ethnicity/identity should not be vilified; however, I'm curious to hear those advocating for more diversity among the heroes of a story are also okay with someone who looks or lives as they do being chosen to be the "bad guy" of a story. Would a contemporary audience automatically assume offense in response to villain who were part of a marginalized group? Is it considered out of bounds to (say for the sake of example) have the evil wizard in the tower be trans? How do villainous characters intersect with a push toward diversity?