When shooting photos of a subject near a huge window and wanting the scene both outside the window and the subject to be lit well, it usually turns out not ideally. The person would be in dark because the indoor light is not as strong as the sun.
Now you can do three things:
1. Keep the exposure to what it is now, and lit the shadow using Lightroom, Photoshop or other photo editing software when you import the photo to your computer. This method requires a decent camera that will save as many details in the shadow so it would not raise the noise when you lit up the shadow. And it also requires time to import the photo and edit it.
2. Bring up the exposure to two stops higher, lower the shutter speed (since he is not moving, it won't change the photo quality in terms of focusing) or bring up the ISO. While these three options do the same thing to the photo- make the sensor in your camera more sensitive to the light on your subject so he is clearly visible and blur out the scene outside the window.
3. You can use a flash and act like a professional photographer:
While you need to be careful when there are more glasses around you because you get a chance of other glasses reflecting the flash, which happened to this picture. Now you can change the angle to avoid the reflection.
But what to do when you are surrounded by glasses and you could not find an angle to avoid the reflection? Bounce the light to the ceiling, which is the skill I will be talking in my next blog post.
P.S. Balancing light could be used if you travel to Chicago during spring break. You know you will go to Willis Tower and take photos!