In photography and especially portrait photography, focal length (more specifically, the right lens at the right distance/positioning) and lighting can have a dramatic impact on the end result. Even the same person can look quite different depending on where the light source is and what lens/distance the photographer is shooting from.
In the 4 gifs below we can truly see the power of lighting and focal length.
And to further clarify and expand on ‘focal length’ the examples seen here use different lenses/focal lengths but maintain the same framing of the image, which behind the scenes would require the photographer to reposition the camera. If the camera was in a fixed position and lenses of different focal lengths were simply swapped out, the shots would just be parts of cat at different magnifications.