If I saw the WoTC gnome art without a caption I would assume it was some kind of elf.
I don't like the WoTC alien-fey cartoon character as a gnome either (though I would love it as a new type of fey, just not a gnome).
The Pathfinder gnome is closer in the right direction to me, though I can see that as being easily mistaken for a halfling. Though I suppose if all gnomes had nature-colored hair and greenish tinged skin I could see that is becoming a readily identifiable marker for a gnome, as opposed to a halfling, who would look more 'normal'. If I had to pick which of the three images would represent the new gnome, the Pathfinder one would be it for me.
Though honestly in my mind I still picture gnomes as your short, plump, bearded folk in funny clothes and big noses, sometimes with a scholarly or tinker motif. An image that I suppose isn't 'cool' enough anymore, but the image that springs to my mind nonetheless.