Smiley Ball Pythons / Emoji Ball Pythons

[Kriton]

Hello everybody,

Some years ago there was a huge hype about the "Smiley Ball Python" by Justin Kobylka.
Since that time I have seen just a few further "Smiley" or "Emoji Balls" and found just a handful of photos in the internet.
Due to your experience: How frequent are such Ball Pythons with smileys? Are they something usual or are they still quite rare?
And did you note any tendency of any female or male to produce such smileys?
I am asking cause this season I paired a Piebald male to a recently acquired het Piebald female and got one baby with one smiley and another one with two smileys.

Thanks, best wishes,
Kriton