This is the most impressive flamenco guitar technique! Have you listened to los picados by Paco de Lucía, Sabicas or Niño de Pura? Sublime!
Picado refers to when you play short or long SCALES with alternating strokes of your right INDEX and MIDDLE fingers; always LEANING (apoyando) on the adjacent strings . You are NOT pulling (“tirando “ ) like classic guitar players do.
What do you have to do? PLAY SLOWLY and HARD, searching for a staccato sound , apoyando the index and middle and mainly. PRACTICE THESE EXERCISES (daily if it's possible).
This falseta is from Alegrias