I'm not one to judge realism but if you have a fantasy world it's usually okay - as long as you know why it's so (and you have a cosmologically sound explanation) it's alright if it isn't exactly logical. I second the 'too crowded' opinion. The shards look neat though, so maybe you could try making them smaller? I like the semi-circle of triangles in the middle. A world can never have enough things that look like pie.