i have one suggestion mate, and that is to choose a font that goes with the notes, i would probably have the same colour in the fonts as in the bg, just a tad lighter, maybe a gradient, maybe some light glow to it... but thats all i would change. imo its done ;)
seriously good work there mate... kudos 2 u, it really inspires me to get better at Ps when i see sigs like yours...