Image Inspiration: Face and Shadows
Color "grading" is the process of making your image look awesome. In this case, the light plunges gracefully into shadow. But something tells me they actually masked to black on the left side of the frame. There's nothing wrong with using all the tools in your toolkit to make an image more beautiful.
You know, like taking a snap from your college dorm and turning it into something awesome...
Your Media Production Mentor