How Paco de Lucia sanded his fingernails
https://youtu.be/C_6Cdc2Zcdc?t=14s
Nails length affect picado posture, angle of attack and speed
https://youtu.be/NfSyCOFpf5M?t=14s
Tips on the shape of right hand finger nails
https://youtu.be/PGQkadtKIxI?t=2m09s
Just need 2 things to learn https://youtu.be/1As8_P1JyF8?t=14s
Do it yourself...and be confused forever http://youtu.be/ThJmDE6fA9c?t=14s
^Ex.1/ 00:14 solo 1
Ex.2/ 09:10 solo 2
Ex.3/ 01:57 topic
........
Your nails and tone quality
https://youtu.be/fVZC_RapTVY?t=14s