Yes do what TOXIC says not brushes or filters but atleast some stock images with some slight effects make a sig go really good.And a thing, glow, I too used to add glow to evrything I made when I was starting at photoshop but then TM told me that adding glow to whatever you made wasnt a smart move to do.I am telling you this because your current sig is really good but the glow makes it go down.Sometimes glows reduce the goodness of a sig and sometimes increase.
Do what I said and then your work will be much much better !