15 weeks!! Any guess on nub or skull?! PLEASE!

Nub or Skull Theory?! TIA!!

http://i17.photobucket.com/albums/b9...ps959d3bb6.png
http://i17.photobucket.com/albums/b9...ps98f5de0c.png
http://i17.photobucket.com/albums/b9...ps1602dda2.png
http://i17.photobucket.com/albums/b9...ps8330bfc5.png
http://i17.photobucket.com/albums/b9...pse4598637.png

I don't see any clues, sorry!

I can't see a nub.... I wish I could!

No clues