One of the best ways to learn lighting is actually trying to figure out how something was shot.
When I started with modelphotography I actually used a mannequin to practice my skills 🙂
To read the light you always have to remember that the whole setup is always right in front of you. It’s literally in the shot as you see it.
The best advice I can give you is actually to read the shadows. If you read the shadows and draw lines you can actually see actually where the lights were positioned and under which angle.
Now it won’t be perfect but you’ll learn very quickly how the setup can be copied 🙂