The original picture (first pic) seemed too bright with not enough color coming through. I decided to change the levels mode to 'Multiply' and lowered the opacity to my liking. I then applied the 'S' curve method and added vibrance to enhance the colors. I then used the 'dodge and burn' tool to burn the greenery, as well as lightening up the face so more detail could be seen.
Hi, I think your use of the channel mixer to adjust the colors is really great and makes the bushes and sky more vibrant.