What makes a good catcher?

[Eric F]

From this position the catcher shifted as the pitcher went into her motion.

Do you have a shot of the catcher in her receiving stance?

There's no problem with a narrow, on-the-toes stance for sign-giving and waiting for the pitcher to start her motion, but it makes a poor base for effective receiving. A wide and stable base (heels on the ground) is a critical fundamental technique.