• Transform hair segment using free transformation.

• Merge two layers: portrait photo and hair segment.
• Disguise sites of a joint of hair using Dodge tool  and hair brush. Download them here.

• Retouch interrupting sites of hair using Smudge tool .

In order to make hair bright and light do following:

• Click the Quick Mask mode button  in the toolbox.
• Choose soft round brush and fill hair area.
• Click the Quick Mask again.
• Choose Select > Inverse selection.

• Fill selection with carroty light color.

• Choose Soft Light Blending Mode and Opacity 49% for this layer.