Switching between the thumb and other fingers is definitely a challenge in these pieces.
Juan, your playing sounds good. Pretty decent tone. Be careful about moving your right hand back and forth so much when switching
between the P and IMA fingers. Check out how some of the masters position their right hand and maybe emulate
a position that works best for you. Also, with your left hand you could try to keep your wrist straighter and curl your fingers a bit more. It
should put less strain on the wrist.
Ben, good job. One suggestion would be to work on producing a less plucky tone. It's something I struggle with myself but when I focus on
it my tone definitely improves. In fact I'll have to work on it with the pieces from lesson 3.
Anyway, just some constructive criticism guys. All the best...