Three Pelicans

I started these three pelicans several years ago and let them sit in a drawer for a long while. Pulled the drawing out a couple of weeks ago to finish it up. I had hit an obstacle because I had not figured out what exactly the birds are sitting on. As it stands -- or as they sit -- the back two are supposed to be on a waterlogged log, and the closest one on a rock. I may add more contrast to the rock. What do you think?