I really like this pic - there's something that just seems captivating about it.
What really makes the picture is all the detail that went into it. You did an excellent job with the shading and lighting, and I love the depth you put on the paw. It's also a nice touch to have the fragments of the broken heart kind of spreading out along the trail, like we're watching it happen - the picture almost seems to be moving. Another thing I like is the look in her eyes and the expression on her face - it gives the character a lifelike appearance, and it feels like she's actually looking right at me.
I am kind of curious, though, it looks like she's inhaling the light coming from the heart - does she feed on hearts? It seems like there might be a little story behind this picture, and a lot more to this character, and it leaves me wanting to know more about that.
This is some really great artwork, and I can tell that you put a lot of time and effort into it. Keep it up! :D I can't wait to see more from you.