Superlative secrets on picado
https://youtu.be/jewga7jspyI?t=14s
Your habits on right hand placement
https://youtu.be/RIiUs9vJAo4?t=10m5s
"Picado" Any reason to rest thumb on 6th String...? https://youtu.be/khHUnE3C_is?t=14s
Thumb Posture & Placement http://youtu.be/Zo_JiZgnG8k?t=14s
Don't feed bad habits, in flamenco matters more HOW do you practice than WHAT to practice https://youtu.be/cVHJWsnUpK4?t=14s

10 things to avoid {1 to 4} when you play scales
1 http://www.rdiaz.org/rdvideo502.html
2 http://www.rdiaz.org/rdvideo503.html

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Thumb Posture & Placement
https://youtu.be/Zo_JiZgnG8k?t=2m16s

Paco http://youtu.be/ewrjyJxYBmo?t=4m10s

Switching Posture to play Scales Longer
https://youtu.be/ImhKH5hSdZ8?t=14s

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Problems switching from "Picado" to "Pulgar" postures ...?
https://youtu.be/y0LOKQhmUEY?t=14s