The colours are really beautiful in the last one with the birds. I Also love the way you are treating the water, it has a lot of movement and energy which has to do with the way you are handing the brushstrokes.
It depends on what you want to achieve to offer suggestion, but I notice that the rocks are rich in color and saturation throughout If you wanted to push for more depth, you could reduce the saturation a bit and introduce more blue as we recede in the distance.