you are improving
You're getting better.
Es bueno ver que estás mejorando.
It's good to see you're improving.
Estás mejorando, no te rindas ahora que vas por buen camino.
You're improving, don't give up now that you're on the right track.
Estás mejorando mucho con la guitarra, sigue así.
You're improving a lot with the guitar, keep it up.