I personally would not catch mine to take pics as the fish or fin extensions may get damaged in the process. Needless on my side of the equation.
Why don’t you take pics of yours and post here and we can assist you to sex the individual or group?
You cannot see the vent area requested from side pics. The vent is the hole behind the anus, and thus cannot be viewed unless the male &/or female are actively breeding.
The males will look like a small triangle. The ovipositor on a female is like a plump rectangle