I like the effect you tried to create in this piece of work. You did quite a good job on finding elements to add to make it fit with the whole robot idea.

There are a small things that i notice though. The scales in the neck can be a nice touch, but they look a bit too flat. They don't appear to follow the round shape of the neck, this makes it looks a bit pasted on.

Although the lines that create the segments of her head are following most of the accurate lines, they are a bit pasted on aswell because it has noreal highlighting or shadow. A thin line of white or black can make the difference to make it look more realistic.

All in all still a nice piece, great job!