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.
You're getting better.
Es bueno ver que estás mejorando.
It's good to see you're improving.
Estás mejorando mucho con la guitarra, sigue así.
You're improving a lot with the guitar, keep it up.