You might be right, it's always good to have some fresh views. The camera is at 10m above ground, the tug is 9m, the palm tree indeed very small with 12m, the river (up front) is about 8m wide. I'll reconsider some sizes, and do another one.
Did you see the avocets? They give a sense of scale, but are not very obvious.
And the rocks were put in the river by using the river mask, with some color adjustments. This mask is a warped simple shape. Try out this simple shape guys, it's very important and useful, despite its name!