They all look roughly the same to me

I recently got a TTM Bar Refaeli success, but on closer examination I noticed the signatures on the photos were different from one another. Also they were signed differently, one being personalized, another having the date. Can anyone give me any feedback on this or am I just going crazy?

http://s987.photobucket.com/albums/ae355/teambrucy/Autographs/?action=view&current=barrefaeli3.jpg

http://s987.photobucket.com/albums/ae355/teambrucy/Autographs/?action=view&current=barrefaeli2.jpg

http://s987.photobucket.com/albums/ae355/teambrucy/Autographs/?action=view&current=barrefaeli.jpg