If it is sexually mature, usually it's the size of the cloaca that determines the sex.
The toe tips are a good indicator of sexual maturity, but the size and age also play a role.
Generally if it's around 5 inches long or larger, and around 8 months old.
Sometimes they're younger, smaller, older or larger before they mature; it really depends.
This one appears to be female, but I say 'appears' to be, based on the view I can see of it's cloaca and knowing nothing else about it.
There is a thread on sexing them; possibly a few of them. If you search for them and read up on it, you'll have a better chance at determining what it is than I could guess for you.
Cheers.