I´m not as sure as Wayne, but the first two pictures are definatly from a female but the last one is too blury to guess.
The size difference can also be a sign for different age!
That rounded snout, thick neck seem likely to be a lady to me.
I'll go w/ three 2, based on it kinda looks more blunt than the others...I'm no expert though lol. It's kinda hard to tell since they are all different angles