You ever have that moment where you’re watching a show, a new character is introduced and you think: “well…she’s going on my waifu list”.  
I never really could say which of the ponies was my favorite but the second I saw limestone, I knew she was it. She’s everything I like about anime girls wrapped into one horse. So I thought it was about time I drew her, and I love how it turned out, SO MUCH GREY!  
I just threw in Marble to fill in some of the space but I think she came out good too.  
Hope you like.
 
Limestone and marble are from mlp fim/I own nothing