When a drawing took so much time, like this one did, I just hope it comes out great. I think it did.
Just throwing my theories in. But I think I should explain:

Basicly, changelings looks like ponies, so what if originally they were ponies? What if they feed on other creatures love, because as love and friendship is the biggest magical power in the world of Equestria, it was taken away from them, so they can't use magic for, maybe evil?

I know, it's crazy (and silly), but I kinda like to think about stuff like that.

Also, in this pic Faust's OC was choosen for to be, let's say punisher (probably not the right word), because I always thought of her OC to be the ultimate goddess of the world.

And for last, the queen not necesserly Crysalis, it can be simply the first queen of the changelings.