Well done learning the lessons. I notice something that may just be caused by the angle of the camera from below, but I will mention it. Your right hand seems to be a little out of position. As a result, you are using a sort of "claw" stroke to pluck the strings rather that a sweep stroke, for lack of a better term to describe it.Your wrist may be too close to the soundboard. If you try moving your wrist out a bit, with a gentle curve, and concentrate on moving your finger stroke from the big knuckle joint rather than the middle joint, you will have not only better tone but speed in time. Your hand should also not be pulling the string up but be quiet and still with movement of the fingers only, sweeping more across the string.
The pictures are a little exageratted but this is what I mean. By the way, this is very common with steel string players switching to classical.
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All this time I thought I was making music; it was making me.
2015 Steve Ganz "Solidarity"
1980 Dauphin D30
1962 Fender pre-CBS P-Bass
National Triolian Uke ca.1930
Almost as many fly rods as guitars