Landscape watercolor painting

This 10 x 20 inches watercolor painting has been painted but there is much to be corrected.  First of all there is a new experiment of putting on watercolor using colors without mixing.  I try to use paint out from the tube and put in layers of watercolor paint from the lightest shade to the darkest without any mixing except on the paper itself.  The lighter color was put on first and then when it is dry, the next layer of darker shade.  The paint is not mixed but sometimes diluted with water to achieve a different intensity or value.  As you can see from the rocks on the right, the color is more intense because I have use it right from the watercolor tube.  The trick to this is not to mix any color and wait for one layer to dry before applying the next.