Just a tip on a useful little nuance. I sometimens use a technique to pluck with the soft flesh of the right-hand little finger. The hand needs to be rotated clockwise and a little outwards and placed close to the strings (somewhat similar to pizzicato) and the little finger needs to be placed on the string parallel to the string so that it touches the string with almost an inch of the soft flesh only (no nail contact with the string!). Also, you need to press deeper "into" the string when plucking. This produces very soft and delicate sound. It only works for single-line slow passages or separate notes, also sometimes for harmonics.
Of course a similar technique can be used with any right-hand finger, and in fact, this is the way people play on lute (not with little finger though). But I found that the little finger produces the finest and softest sound.
Paulino Bernabe 'India' 2001
Masaru Kohno No.20 1975, No.6 1967
Rokutaro Nakade A9 1969, custom 1967, A1 1962
Mitsuru Tamura No.800 1969
Takamine C136S 1976