Star Trek: Picard actor Isa Briones reveals how Brent Spiner worked with her to develop Data's famous head tilt for her character, Soji Asha. Picard season 1 established that Soji and her deceased twin sister Dahj were Data's 'daughters'; the synthetic twins were built from one of Data's positronic neurons by Dr. Bruce Maddox (John Ales), Dr. Agnes Jurati (Allison Pill), and Dr. Altan Inigo Soong (Brent Spiner). Soji was programmed to believe she was human but when she was 'activated,' Soji remembered she was an android and began exhibiting certain traits of Data in Star Trek: Picard season 1.
https://screenrant.com/star-trek-picard-brent-spiner-taught-isa-briones-data-head-tilt/