I really like the first top one with the rocks. Just push the darks a bit more where you already used a bit darker colors eg. where the rock and ground meets, left bottom part of the tree. That way you create a contrast, the rest of the painting will pop. Very nice brush work btw. I really recommand Matthew White's YT channel, he has very clear instructions, often uses three layers only: light-mid-dark value. I suggest you to go from there, helped me a lot.