Ok here are things you can improve :
1-the right side is kinda idk , ruins it.
2-other than the render and the BG it looks kinda empty , use some brushes and effects.
3-the text stands out too much , try diffrent color or use the dodje/burn tool to make it a little brighter so it wont stand out too much.
4-where you placed the text isnt really good imo , i will pm you the text placing toturial later.
5-the render is over used , gets boring too see it too much times if you know what i mean .
Other than that its a nice siggy , i like the style , i would give it 6.5-7/10
Also , whats the name of the font ?