use subsurface scattering shader for the gooses. as I know, goose can’t fly (maybe Canadian bird). emm the goose’ neck is to straight (the one which is on the water).
This is a nice scene. I think the textures look a bit flat. Some depth would give the scene some more life. The wall is a bit too clean for my taste. What about some broken edges or some more green climbing on it? Add a few more items in the scene like leaves, furniture or other elements. Then it’s not that clean.