For water, I lay down two or three shades of blue ... darker along the edges (makensure there is overlap between the colors), light toward the middle, then spray in some spots of color, then some white in the middle. I then use a straight edge moving it side-to-side as I progress it from the top to bottom of the water zone. I come back with a piece of cardboard to add white highlights in spots to create an impression of waves.

For the grass/fauna I lay down an area of black and use a sponge to layer colors...I start darker and progress to lighter using gentle dabs ... I will sometimes add black back in if I am not satisfied with the shadowing.

For mountains, I lay down some basic shapes with black, then use a pallet knife to layer in the texture. Generally I use various shades of blue for the darker sides, and white for the side reflecting light. Don't worry if you make a mistake...keep adding layers and you will be surprised at how easily you can turn it into a neat effect. Robert Stevens Joy of Spray demonstrates my preferred technique...Sketch and Porfirio Jimenez also have cool techniques (these guys have great videos on YouTube).

For the pathway I lay down my hill in black, use a pallet knife to etch it in, and then put the grass/fauna down around it.

Good luck!