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I think these are great with good colors and processing.
For grand scenic landscapes there are usually a lot of elements to hold our interest; e.g., clouds, mountains, trees, shrubs, grasses, reflections, etc. This type of image is simpler in many ways. The individual leaves are not important and the patterns of color become important. Patterns is just another way of moving toward the concepts of composition. Even if not consciously done, you have selected compositions. For example in the top image, there appears to be some natural vignetting leaving the brighter areas in towards the center to help hold the viewer's attention. At the top of the image there are some nice arching tree limbs which almost frame the image. I believe you make these choices without a lot of thought. I think you would have more consistent success with more conscious effort and maybe even some post processing to intensify the effects.
I did a quick rework of the first image. I intensified the vignetting and lights and shadows to try to pull the viewer's eye into the scene and kill some of the flatness. This edit is way overdone to stress a direction that could be taken with images such as this.
Way over processed as an example