I added some darker areas, lightened some areas that were too dark and added some texture to the foreground. An easy way to do this is to use watercolor pencils. Wet the area with a little water on your brush. Put the painting down flat. Use a 100 grit sandpaper and hold it and the pencil vertically over that area. Sand a little of the point and little specks of pigment will fall on the wet area. Let it dry naturally. You can use more than one color this way. Do not wet any area that you don't want to have the specks, or cover up those areas with a piece of paper. If the specks fall on a dry area, they will brush off when the rest of the painting is dry.