Compositing allows to break all barriers of what is possible and is only limited by imagination. We're able to create images of any complexity.
To put it into perspective, this is how many files it took to create the image below. HDR processing, advanced color correction and very precise masking had to be used.
This image for Bayer/Claritin ad was created from dozens of images, some were shot in a studio and others were purchased from stock resources: