1. Pictures don't work
2. There is no way that anyone can predict how your mantis will act. It's like trying to put a garantee on how the weather is going to turn out precise to the second for the whole of next century. And if it was possible to make a fairly accurate guess, it's pretty hard when the information you've given us = nil. You would have to tell us everything from how many seconds it shows its head every day, how it reacts when it sees you, whether you have a cat or dog that likes to stick its ugly mug up to the tank to investigate, whether there are aggressive fish in the tank intimidating the mantis etc.
just saying