For organizational purposes it is a good habit to group your layers. Select all the castle related layers (you can select multiple layers by holding Ctrl and clicking on each layer) and press Ctrl + G to group them. Name the group Castle.
Now it’s time to create our floating road. Open file “Desert”. Using the rectangular marquee tool select the desert, copy it and paste it into our scene. Transform it to Smart Object and position it as shown below. Also, position the desert layer below the Castle group in the layer palate.
Add a layer mask to the desert layer (Layer > Layer Mask> Hide All). Now the desert will disappear from the scene because the layer mask is all black. With the standard chalk brush and a white color at 100% Opacity draw something resembling a road in the layer mask. Name this layer “Base Dirt”.
Create a new Curve adjustment layer and clip it to the Base Dirt layer. Drag the curve down to darken.
Duplicate the “Base Dirt” layer (Layer > Duplicate Layer) and rename it Base Volume. Drag it above the Base Dirt layer in the layer palate. Press Ctrl + T to Free transform and position it as shown in the image below. With this little trick you have created a very convincing road which we will improve in the next steps.
Create a new layer and fill it with a blue color sampled from the sky (#77889c). Clip it to the Base Volume layer.
Select all the road related layers and group them (Ctrl + G). Name the group Road.
Now I am going to teach you another useful trick. We want to apply some Adjustments layer to the our road group but we don’t want them to affect other layers. How do we do that? Well, we could clip all the adjustments layer we create to the road layer but that will look messy and there is a better way. We simply change the blending mode of the group road from Pass Through to Normal. Now any adjustment layers inside the group will only affect layers inside the group. We could create a Curves layer and drag the curve all the way up to brighten the scene – only the road will be affected. Alright, let’s change the blending mode to Normal.
Create a new Curves Adjustment layer and fill the layer mask with black. Drag the curve down to darken and in the layer mask paint with a white round soft brush over the indicated parts.
Create a new Curves Adjustment layer and fill the mask with black. Drag the curve up to lighten and in the layer mask paint with a white round soft brush over the indicated parts.
Create a new Hue/Saturation Adjustment layer and drag the saturation slider to the left.
Create a Curves Adjustment layer and use the settings shown below in order to change the color of our road in order to match the sky.
And that’s it, this will be our floating road. But since we will need to make multiple copies of it and we will not modify it further it would be wise to duplicate the group and convert it to smart object. Click on the group to select it, duplicate the group (Layer > Duplicate Group), right click the duplicated group and choose Convert To Smart Object. Rename this “ConvertedRoad”. Turn off the visibility of the original road group.