Hi Jusete, I do not strongly agree with the other opinions on these last two map. The soil on zz1 is much too dented, it is what bring out these species of black spots. The sands, it's fine maybe your texture is too big on the ground, try to shrink it, the second big defect on both maps, is that we see a lot of the triagulation of your rocks. In small they are beautiful, but when you zoom in it is seen a lot. I redo zz6 on 3ds max to show you the rock how you can work to be realistic. I think I find your fault: p. You need one! haha