I think every good composition needs a bit of spark, an unusual accent or something out of the ordinary. That zinger that gives it a bit of excitement.
With that in mind, I chose the yellow floral that you see here, adding it sparingly across the middle of the piece, along the river. I think it pairs nicely with the adjoining fabric of green leaves on a black background - both have patterns that are similar in size and scale. But while the green and black leaves work well with my other fabric choices so far, the yellow floral seems too intense in color. I would like your eye to be drawn to the birds first - not the odd yellow flowers in the middle!
I've searched my stash of fabrics and can't find anything that I like or that would work better. And I'm not ready to give up on it yet. A lot of the remaining fabrics I have in mind for this quilt are yellow-greens so perhaps they will help this yellow floral to fit in. In the meantime, I'm keeping a careful eye on it and my fingers crossed!