I'm starting to do a robotic head,this is the first part of it,any advices,ideas needed and appreciated.I need ideas on the colors too

wow very cool
awesome start

if you want better detail,use a thinner brush but anyways gl on your head

What program are you using? If you're using gimp, I'd use a brush size of around 0.06 for fine details, as the thinness appears semi-opaque. Good luck on the head!

Update:
I use photoshop

uhh? i would suggest putting a spinning head so people dont copy

its nice though,but i dont like the colors..u should make visor glow like bright green when u put eyes in

Ehm, it all looks like it's scribbled on with a very old pen. It really makes it look bad, the idea is nice, the effects aren't too bad, but the awkward lines make it well.. quite horrible. Oh and it's asymmetric.
Try using the pen tool for curves, atleast that makes them smooth (I don't know if you're using photoshop, but I'm just assuming you do)
Apart from that it's not that bad. Maybe try adding more details like glow and reflection, these are all matte colors and that makes it look boring.

mapleleaf, not all of us likes pen tool :/ but i just learned using it and it is better for curves.

now to the head.
the shading on the visor is bit off, otherwise the shading and stuff look good to my eye you are improving

needs more reflection, and also remove those bent lines under the visor, it just doesn't fit in.

Are you mad?

pen tools rule... you can even make it behave like a brush

also makes scaling textures up and down a snap...