This is great! I love the colors, and Candance's expression! The only criticism I can offer is the lack of lines around Candance's eyes - given how broadly she's smiling, I would expect her cheeks to be a little more defined, kinda like they were being 'pushed up' by her smile (if that makes sense?).
She's beautiful! When I first saw this painting I didn't realize it was a pony thing. Something about her face caught my eye. I like the style: Mostly realistic but with some visible brushwork and very slight exaggerations. The glimmering necklace is fantastic.
Did you have a real model for the girl or jewelry? Or can you do all of this from your imagination?