(at the risk of saying something incredibly stupid, and totally contrary to the original artist's reason)
The panelled line on the face: yeah, when you see robot illustrations, the seams follow the shape of the body, rather than forming a straight 'slice'.
- I think the artist already knows this, since the panel edges on the torso follow the shape.
- The vertical line on the face doesn't destroy the pic; I find it helps draw your eye down the whole image.
- It's an interesting feature, since it seems that the robot has been posed at this precise angle, and makes you wonder what would happen to the contour of the seam if the head was just turned towards you.
Or not. But I still enjoy what that seam adds to the face.
All in all, nice earthy colours, great hair, and some nice brushes used for the background and skin. Can't fault it.