What is regarded as one of the most vital parts of a camera​

the lens

The lens is one of the most vital parts of a camera. The light enters through the lens, and this is where the photo process begins. Lenses can be either fixed permanently to the body or interchangeable. They can also vary in focal length, aperture, and other details.

the first thing you will need is patience a simple drawing can take 2 years the more time the better, you will start by copying some drawings and when you get better at it you can start doing your own drawings. when your drawing you need to be super patient. even proffessionals learn new things all the time. i hope this advice .

that picture though