Hi Duang, very good recordings with the exercises and the Valse. My suggestion for the Valse is the same thing I gotta improve which is to achieve fluency.
Haris I love the fluency in playing the chords and the Valse. I like this quote from Rick and not that it would apply to only one of us but to all of us,
Rick Beauregard wrote: The only thing I can suggest is adding a little more feeling in the Vals (and even Accords) now that you've mastered getting the dots right. As I heard Segovia say in 1981, "Rhythm should be like a road lined with trees, not telephone poles."
After watching all of us playing the Valse I go back and watch Delcamp playing the Valse and what a difference when he plays it, it sounds so beautiful, melodic, inspiring!