Photoshop prctice

This is one of the photoshop work practice taken from one of my job poster. As the model in the middle, I have used the skill to edit the color tone.
The model's face is divided to two parts, the left hand side is with color and the left hand side is used the channel mixer to turn the original color to black and white. Besides, I also added a layer above the left hand side face. I used brushes to add color onto this additional layer. The opacity of the brushes are made to 15%, so this bring a very soft and natural feelings to the whole picture. Also i have changed the brightness/ contrast of the right hand side face, Overall, this give a big contrast of two parts of the face.

The photo below is the original photo of the model.