Agree with chris, An outerglow is one of those things, its rarely possible to use one and actually pull it off... I think its too obvious on yours but maybe lowering the opacity to 30-50% would make it more subtle? also Im not sure about the D being the wrong way round? did you just do it because others do or is there a purpose? Lastly, Perhaps a slight gradient on the 3d element would make it pop that little bit more, I think some form of light/shadow (very faint) would add soo much to the graphic.
Its a great start but I think it needs a few minor tweaks! Nice work.