1) Removing shines:

Follow the diagrammatic view to understand the same.

The shine on the models face spoils the shot over quite a broad area.

Make a feathered selection of the shiny areas to be fixed. Feather should be around 8-10 pixels.

After making the selection create a new layer by the name remove shine. Use an eye dropper to sample the color of the midtone of the skin.

(1 and 2): Fill the selection with the sampled color. By going to Edit> Fill.

Go to the Remove shine layer and reduce its opacity to 60%

Shine removed.

2) Adding and enhancing Highlights:

Follow the diagrammatic view to understand the same.

Picture is a little flat and needs some highlights.

For this, create a duplicate layer by the name highlights.

Select the dodge tool and set its exposure to 50% at midtone range.

Drag the dodge tool with soft brush over the cheek bones. If you are getting strong highlights then reduce the exposure even further.

Try generating some highlights above the eyes too.

If you feel that the highlights are too strong then you can create a mask on the highlight layer. Paint on the mask with a black brush to retrieve the original areas of the skin.