I started this about 2 hours ago.
It's 17 colours so far. I didn't really care about the colour palette at first, but now that I've done the head I realise that I probably shouldn't need any more colours for the rest of the robot (if I ever get around to completing it).
If anybody else wants to have a go at finishing it then feel free.
My simple pixel style might be a little easier to copy than the other more detailed heads that Saiyan and Tom have made.
This is the reference image for anybody that hasn't seen it:
