@Background Pony #08C3  
It’s a matter of taste like anything else; tolerance of uncanny valley effect varies on personal level.
 
You can see some commenters like the above picture as well, even when, I’m pretty sure, most would find it creepy as hell. And these figures did sell for a good buck, too.

@Draco_2k  
That’s not creepy at all,i found them cute.

@Background Pony #91C7  
Well, you’re in luck: Hasbro already proved it’s creepy as hell all on their own.
 

She is quite gorgeous.

This one’s not bad actually. I kinda like the ankle cutie-mark.
 
@Background Pony #7B54  
Twilight being depicted with darker skin is done alot in fanart. Kinda surprising considering she dances like a white girl. :P  
(Bad joke, I admit.)  

@Background Pony #91C7  
See Draco2K comment below

This makes me wonder. If you’re working with darker skin, what would a more properly-done color scheme look like?

See, you can say that critique all you want, but there’s no way I’m buying “Literally all pony hair works with white skin, but barely any pony hair works with dark skin. it’s not racism, it’s just color palettes!”

@The Smiling Pony  
True story.

@Background Pony #70B3  
Well, in this case, it’s just creepy as hell.
 
For starters, you can’t depict dark skin as actually black anymore than you can paint white skin literally white. Skin is a shade of coffee, not shade of matte paper. “Paint what you see, not what you think you know” is a common advice given to artists.
 
Second, you can’t lean too much on life-like anatomy and realism if you’re keeping cartoonish proportion and elements, which introduces the uncanny valley effect which makes you want to run away from the thing depicted very fast.
 
Third, pink hair, yellow sweater and green fingernails are a color scheme which could only be mistaken for good taste by someone with color blindness much more severe than even myself.
 
And a bunch of other reasons I’m probably not qualified to explain.
 
tl;dr: Black people aren’t black.
 

@The Smiling Pony  
Oh, right. And the easy trolling from just pressing the downvote button and watching people talk about why it’s downvoted.
 
We had this one guy with 12 or so accounts downvoting humanizations just to watch people complain about it in the comments. Low effort high yield trolling.

@Background Pony #70B3  
For some, color chash; pink hair doesn’t work well with all skin tones. Others, waifu syndrome, meaning that if a humanized image of their waifu deviates too much from their ideal, they hate it.
 
And a lot of it is historical reasons. Back in Ponibooru, some people would troll the comments of non-white humanizations, as trolls are known to do. That lead artists to create more of them explicitly to annoy those trolls (the logic in all this eludes me as well). That lasted a while, and for many any reminder of those events is bitter and often seen as an intentional callback to that rather than an “alternative headcanon”.

@Background Pony #70B3  
I think the issue here is more about pure esthetic than racial prejudice.A black humanization fit better with Twilight for example who have laready hair of a darker shade of purple

Why does this image have a greater-than-average number of downvotes for fanart like this, one that’s not hateful or obscene in any way at all?

She look cute,i give it that but i persist  
IMO,a darker skin color clash horibly with bright pink

Well THAT is unusual. I honestly would not have imagined Fluttershy to have nail polish in seafoam green… though I suppose it DOES match her eyes.