The Planet layer is now visible in the image, but it appears on top of the giraffe and the trees. 

We can fix that by changing the order of the layers in the Layers panel. 

Drag the Planet layer below the Waterfall layer. 

Release when you see a blue line under the Waterfall layer.

That looks better! Now the planet appears behind the giraffe and the trees. 

Reordering layers in the panel changes the order of the images on the canvas. 

It's a good habit to first select the layer you need to work on. Click on an empty part of the Moon layer to select the layer -> Moon.

Drag the moon down to position it just above the giraffe's head, to make it look as if the giraffe is reaching up to the moon. 

We don't really need a second moon in the sky, so we'll use the Spot Healing Brush to remove the smaller moon.

Whenever a tool is selected, notice that the options across the top of the screen change!

Place the circular cursor for the Spot Healing Brush over the small moon and click and pull over the second moon to remove it. 

The background looks a bit too bright for this twilight scene, so let's use an adjustment layer to darken the sky.

The controls for an adjustment layer are found in the Properties panel. 

Drag the Brightness slider to the left to about -35 to slightly darken the Clouds and Stars layer. 

The controls for an adjustment layer are found in the Properties panel. 

Drag the Brightness slider to the left to about -35 to slightly darken the Clouds and Stars layer.