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Mask based on the Blue copy Channel appears. Go to Select > Inverse or press Ctrl + Shift + I on your keyboard to invert it.
Click on the layer mask of the SKY, grab the Brush Tool (B) and pick black color. Now paint over women's face and upper parts of trees. After you're done press Ctrl + D to deselect it.
On the following picture you can see how your picture should look like so far.
Step 6 - Adjusting the Sky
Blending of the sky is done, now you need to adjust it a little to better fits to the rest of the picture. You'll do two things - increase the contrast and desaturate it.
Let's start with desaturation. Add new adjustment layer Hue/Saturation. You can find the button Add new fill or adjustment layer on the bottom part of Layers palette next to the button Add new layer mask you've used in previous steps.