I finally broke down and started throwing some acrylic around on the piece. And I'm glad I did. I think it added a depth that would have been hard to achieve with my watercolours (not that it couldn't be done, but it would be a different kind of aesthetic). Anyway. This is what it looked like after a quick scrubbing in:
Some work done on the foreground grass:
Some general fiddling around:
Acrylic glazes on the bird:
This painting is finished now. Once I've varnished it, I'll post the finished piece. Stay tuned!