Okay, This might be a large description, but I just want to explain the choices that I made with the skeletal anatomy. If I miss anything that you’re curious about, you can ask me about it in the comments.Also, keep in mind that I made up most of what I wrote down about the Skeletal anatomy since I believe that Undertale skeletons are Very different than normal human skeletons. Though, if you disagree with what I say, I respect your opinion.  
Eye’s- Alright, So this is what I know about Skeleton eyes, they may seem like an inverted colored eyeballs, but the white dot’s in their eye sockets are supposed to resemble pupils. They are actually magic lights hidden in the back of their skulls. I’ve also seen other Skeleton OC’s use shapes as pupils. Magic is one of the few ways a monster can express themselves, and Since most of a monster(skeleton)’s body is made of magic, I thought that putting hearts in Scootaloo’s eyes would be a cool way of expressing her very childish and loving personality.  
Hair- Once again, a Skeleton is mostly made of magic. and just like the eye’s; The hair is entirely made of magic. It’s another way for Skeleton’s (Mostly Females) to express their magic with their hair.  
Skull- You might notice the huge holes in her skull, I had to look up a picture of a horse skull, and they have large holes where their ears normally are. Also, I thought that if I made the skull look more realistic, then it wouldn’t be as cute, and possibly disturbing, So I just gave her the same skull type as Sans.  
Clothes- I didn’t want to change her clothes because i’m too lazy ;w;  
Wings- I had to look up a picture of a bird’s skeleton to draw the wings and get them to look right. Sadly, she can’t fly. Though, since she IS an undertale Skeleton, she could possibly use magic to fly, but IDK honestly…  
Boobs- A lot of people are going to get mad at me for saying this, Skeletons have a transparent magic field that surrounds their bones that resembles a body when they wear clothes. You can only see it when they’re wearing clothing, and once it’s all removed the field disappears. The only areas that the field doesn’t cover for females are the forelegs, forearms, skull, hands, feet, and cervical vertebrae. It’s the same for males, but the ribcage is also uncovered.Once again, I made most of this stuff up since they aren’t real. Tell me what you think in the comments!  
#sansxscootaloo