What exactly is a "Nobita face"? After Gankyou in Joshiraku removes her glasses, her eyes change to '3' characters.



Marii then exclaims:



I understand Nobita is a character in Doraemon, but I haven't found any information online either of pictures where Nobita has his glasses off, or any references to a "Nobita face".

Can someone explain this joke further?
From the Doraemon Wikia:


  Nobita's eyes are never drawn consistently. Sometimes they look like the number 3, sometimes they're black beaded, and sometimes, like in the case of the recent movies, they're normal eyes.