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If it has a yellow saddle on its back then its female.
Its not if carrying, mine show all the time but they do breed like rabbits.
The one on the right looks to be female, while the one with its backside up in the air looks like it could be male. If you do get a chance of some clearer/ closer pics it will help to see how far the shell extends down the sides of the rear legs where the females care for the eggs until hatching. In this region on shrimp the males are slim with no hanging down/ extended shell.
Food that they like is usually the best trick for getting them to stay in one spot where you can photograph them .
Carrot is fine for them, they really will pick at anything that takes their fancy, mine can't resist the catfish wafers and algea wafers that are meant for the fish.
Here is a pic of a female cherry shrimp showing the longer sides of her shell I was talking about
A female carrying eggs
I would tend to say that with the side skirts on the females it is harder to tell just how long thier swimmer legs are while a males legs you can see clearly due to them lacking the extended sides.
I'll try to get a picture of a male, I usually have only photographed my females to compare and grade them.