the first thing i'm noticing is there is a lot of negative space in the lower left corner that makes it look like you might want to focus in a little more around the top right maybe the bottom should be the top of where the text is now or you could increase the size of the text a bit at least in the thumbnail. full size the composition does look better but it still might not hurt to crop it a bit. you may want to try it and look at it. i'm not saying making it fully balanced but that bottom left just looks empty and unused. looking at the thumbnail i like the blur it gives to the pink crystal part. it might not hurt to soften some of the edges there. Keep in mind this is just a quick critique and you should look ask Mrs. K is she'd give you something more in depth.