The design doesn't matter, if it is a male it will have longer claws than a female, it will also have a bigger base of the tail. I'm only 12 years old but I know a lot, I hope I could help.
Females are larger than males
I think I have a male turtle... His side lines on his head are a orange and he has a stubborn personality lol.. He is not a sea turtles hes one of the land turtles.. Cute and friendly.