See if you can use any of the information there to help you take an educated guess. Obviously, a molt is the best way to determine concretely. Hope someone comes along to take a stab at it @Arachnophoric@Ungoliant@Liquifin
A regular picture of the T. is good enough for a guess instead of ventral sexing if it's 3''-3.5''. At that size it's most likely either mature or pen-ultimate if it is a male since most males mature at 3.5''-3.75'' if male. A regular dorsal picture can easily tell if it's male or female at this point in size, so a picture of the dorsal with it's legs and carapace would likely help.
But taking a look at the ventral I would say female.