The top image is my second try at the color comp, I brought in the old one for comparison. I like the over all composition better because I played with angles in this one. The change in colors was pretty successful, I think, but I did get a complaint or two on the orange. I agree, orange doesn't really characterize the sound of whistling. I think I'll change it too a cooler color, probably teal, and all of the colors will be a bit more saturated in the final. The girl was generally better-liked this time (I think it's the freckles and the slight smile), but a few people said something about her wasn't right. I think it's in the neck/jaw area. The bird and hand were much better this time too, the placement was a little awkward in the last comp.
When I go at this with water color, I plan on making a lot of expressive marks in the background and waves.