It would be good to sing. I almost heard the tune!
Just a bit into the ballad, there is this image of the lady leaving a fish on a street-corner. Well, nobody will take it that way - but a fussy poet would get a few interesting thoughts about mixing metaphors, out of that one!
I just been reading Dylan Thomas, who doesn't just mix metaphors he chops them and blends them. So to speak. Well, if he got famous, mixing metaphors can't be wrong. But sometimes you could get an un-intended effect?
It isn't really a mixed metaphor either! Nothing mixed about it. But I still saw the fish getting dumped on the street corner. Maybe I'm a bit twisted.