I love the actual way it's painted. Really nice. My initial thoughts are that the lighting isn't carried through the porch to go with the characters. On one hand that does emphasize the characters but on the other I think it could be a nice way to guide viewers eyes when they zoom in.
Otherwise, I'm with the cropping, except maybe zoom out? Give some space. Just an option.
And the expression of the girl in the middle is a little cross eyed.
This falls under nit picky for sure, but I would add frets and a nut on the guitars. As a guitar player I notice stuff like that. So that's a me thing
But like I said, the technique and style is actually really lovely. The characters have personality. They hold the instruments well and you get a good sense of the mood.