The BG C4D isn't centered, I can see the core down her shoulder, that's wrong. I know topaz clean is cool, i dig it myself; however, in this signature it doesn't fit. You need to show the flow "indirectly" topaz from the other hand emphasize it and changes your focal points. Kill the text, it doesn't fit at all, and it's ruining whatever flow you have left in your signature. Could use stronger light effects and more color gradient and perhaps some curves and levels. It feels like if you just put dem c4ds place ur render and call it a signature e.e