It's a ukelele, they're small.
I'd have turned her the other way. I like the arabesque of the stream, but I wish that it was in front of her, in the "live" space, rather than behind her. I also would like it a little wider, since this is about a girl and a stream, let's see the stream. Of there's a paper mill just out of frame left, well, so be it. If there's the remainder of an appealing curve in the stream, though, I want to see it.
Light rather dull on her. But she looks quite nice!