One of my workshops for EDM (Exploring Digital Media) was to explore working with layers and Painting with Light in Photoshop.
We did this by photographing a Motorbike in the studio using various lighting angels and keeping the camera in a fixed position.
Then in Photoshop the images were edited by layering the images and painting in from each image (layer) the parts that were correctly exposed.
This process is used because it is very difficult to get the correct lighting in just one shot.
This technique is used widely in Car Advertising.
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This is my edit of Motorbike in the studio processed in Photoshop.
Started with my base image.
And used the other images to paint in using the brush tool and
layer mask the different parts of the bike.
Added a Texture and Reflection