Download Lightroom presets and LUTs, absolutely free. Use the presets to add creativity and style to your photos.
But back to the tutorial...
Grab the Brush Tool (B), pick black color and paint over the harsh line of the sky to make nice, soft transition. On the picture below you can get inspiration what to achieve.
Step 5 - Channels
Women's face is still darker because of the Multiply mode and if you look carefully you'll see that upper part of trees is bit darker because of that too. You need to create mask of which sky should be hidden.. To do that you'll use Channels.
First make the layer SKY invisible. To do that click on the eye icon left to the Layer thumbnail.
If you don't see this palette go to Window > Channels and it will appear. On the palette you can see four different lines - RGB, Red, Green and Blue. If you let visible only one of the Channels you'll see only values from that Channel.