Right-click the canvas while a layer is selected and while the Brush tool (B) is activated and then click on the button highlighted below:

Then click on "Reset Brushes" from the contextual menu.

Now, that that is done input the following settings for our Brush tool (B):

• Brush size: 200px
• Hardness: 0%
• Opacity: 15%
• Flow: 100%
• #: 000000

Note: The "#" means the color of the brush. 000000 is the color black, but to make sure that you will be using that brush color, follow the steps below:

After clicking the Foreground tool, the Color Picker box would open. Once open, input the following on the # space:

Your brush now has the black color; so now, let's get ready to paint.

Now that that's done, we are now set to paint!

On the "darken 1" layer, paint this out using the brush settings:

The result of that should be similar to this:

Next, create a new layer (Ctrl/Cmd + Shift + N) and name it "Darken 2". Activate the Brush tool (B) and input the following settings:

• Brush size: 400px
• Hardness: 0%
• Opacity: 15%
• Flow: 100%
• #: 000000

When that's done, get ready to paint.

The result of that should be like this:

Create another layer again (Ctrl/Cmd + Shift + N) and name this layer: "Darken 3".

Activate the Brush tool (B) and input the following settings:

• Brush size: 1200px
• Hardness: 0%
• Opacity: 25%
• Flow: 100%
• #: 000000

Now let's start painting:

The result of that should be similar to this:

Now, let's create another layer (Ctrl/Cmd + Shift + N) and name it: "Darken 4".

Next, activate the Brush tool (B) and input the following settings:

• Brush size: 800px
• Hardness: 0%
• Opacity: 15%
• Flow: 100%
• #: 000000

Let's start painting, then!

The result of that should be similar to this:

Now that that's done, we'll now proceed on fixing the light of the sky.

To start, create a new layer (Ctrl/Cmd + Shift + N) and put this layer above the "sky" layer, name this layer to "Light 1".

Once that's done, activate the Brush tool (B) and input the following settings:

• Brush size: 200px
• Hardness: 0%
• Opacity: 15%
• Flow: 100%
• #: fffedd

We're all set now, so let's start painting:

The result of that should be like this:

Create another layer again (Ctrl/Cmd + Shift + N) and then name it "Light 2".

Activate the Brush tool (B) and then input the following:

• Brush size: 80px
• Hardness: 0%
• Opacity: 15%
• Flow: 100%
• #: fffedd

Let's paint:

The result:

Once you're done, create a new layer again (Ctrl/Cmd + Shift + N) and name it "Light 3".