why?
you see the shape of the skull, muscles etc. (or object)
understand the structure of a thing and how it occupies space.
You see how according to the light on it, parts of it melt into the background and some are clearly defined, the angles and planes
you see where the weight of a body or object is and where muscles are relaxed or tensed.
you aren't merely copying but observing and are creating something more original, small quirks of your own creep in, creating a livelier drawing with your own particular character to it - compare the work of Lucian Freud and Hockney or Leonardo and Durer - they are all observing from life and their results are very different.
link to website
this link is to the BBC website, the section on a new programme (started tonight), on drawing through history and it was interesting, They showed a lot of Leonardo's drawings of anatomy - a current cardiac surgeon had changed his way of doing a particular operation in response to looking at Leonardo's drawings of hearts and in particular the valves, which were in great detail.
Stubbs spent 18 months studying the anatomy of horses, hanging up carcasses and gradually stripping them down to the skeleton, making detailed drawings of each stage,
I'm
not suggesting you do this!
but why did these artists think this was important? - they wanted to
thoroughly understand the thing they were drawing. If you draw from a photograph you are looking very superficially and unless you have done a lot of drawing from life you won't have an understanding of the object/body/whatever to do anything but a shallow illustration.
Yes Degas used photographs - BUT he'd drawn a lot from life and had the underlying knowledge to take them forward into something creative.
It depends how seriously you want to improve. If you just want to have fun and not worry about learning much, then that's ok - but if you want to seriously get better then you have to work at it. Nothing comes easy.
incidentally - Audubon apparently thought it a poor day if he shot less than
100 birds
- he worked from 'fresh' ones as the colours of some parts change within hours.