Your first picture has a line of rocks that stand out to me out of every aspect. While the trees look naturally slanted and the hills look beautiful, but the line of stones that fall (?) down the hill is out of place. It juts out and doesn't look to be blended in with the grass blocks around it. In nature smooth stones are usually a sign of water that has eroded away it's surface. Because there is no water nearby I highly recommend adding some texture to make it look more dried up and broken. If you are to put water where the stone ground is laid out then I recommend clearing out that stone line entirely and placing stone buttons on some andesite/gravel for increased texture.