Download the brunch brushes listed in the beginning of the tutorial and install them into Photoshop. If you don't know how to install brushes you can take a look at this tutorial.

Create a new layer on the top of all layers and name it BRANCHES. Grab the Brush Tool (B) and select one of the brushes you've just installed. Pick some dark brown color and set the Opacity on 100%. Paint the branches.

Right now the branches look flat but you want them to have plastic 3D look. You'll fix it by adding layer style named Bevel and Emboss.

Click on the button "Add a layer style" which can be found in the bottom part of the palette Layers and select the option Bevel and Emboss...

Set the layer style as on the following picture.

Now check the option Gradient Overlay and set the window as on the following picture.

After this step you should have something similar to the picture below.

Step 14 - Flying Hair

As you can see on the preview picture you're trying to create stormy weather. Besides other things it also means wind. To create impression of wind you'll add flying hairs to the woman in this step.

Create a new layer on the top of all layers and name it HAIR. Download the hair brushes listed in the beginning of the tutorial and install them into Photoshop.

Grab the Brush Tool (B) and select one of the brushes you've just installed. Hold Alt on your keyboard to activate the Eyedropper Tool and pick some darker brown color from woman's hair. Paint the flying hair.

To make hair more realistic looking you need to add some highlights to them. Select some soft round brush, set Master Diameter on 1 pixel and lower the Opacity on about 30%.

Hold Alt on your keyboard and select some light color from hairs. Paint the highlights similarly as on the following picture.

Step 15 - Darkening the Clouds

According to me clouds deserve more contrast because they should be heavy stormy clouds. Highlights are already fine, but shadows could use some adjustment. You'll use quite the same process as in the previous steps.

Add new adjustment layer Levels on the top of all layers and set the Input Levels on 0; 0,45; 255. Change its Blending Mode on Luminosity and fill the layer mask of this layer with black color.