It's a start, but it needs more color variation. Try not to make anything with a monochromatic tone to it. Anyway, I've just completed another "Sci-Fi" type texture. I think this one is a lot better than the previous one. 100% hand painted (or rather made from scratch).
Diffuse:
http://img155.imageshack.us/img155/2766 ... 01d8pi.jpg
Normal:
http://img155.imageshack.us/img155/5240 ... 01n3se.jpg
Specular: