Ah, Zelda's lullaby, one of my favorite O.o.T songs.
Well honestly, i would say this needs quite a bit of work, for my taste there are too many mistakes and wrong chords. I liked the calm intro although i'm not a fan of the bluesy grace notes you put in there.
Source usage seems fine, it's used almost throughout.
I think the arrangement could be improved too it's kinda lacking direction imo, but you said it was an improv. so you probably didn't focus too much on arranging i guess.
What happens from 1:20 - 1:27? Sounds like a drummer wants to join
Yeah keep at it, try to improve your performance and most important have fun!