Even when you work from life if you want to make an effective piece of art you've got to make changes, proof: caricature. Caricature is just a super obvious example of what goes on in every piece of art. Can everyone who works from life make an effective caricature? No.
Working from life is no guarantee that you're going to be studying form and rendering it in your drawing, proof: the Angel academy method.
Photography has permanently changed the way we make pictures. Since everything you know about art influences everything you do in it learn as much as you can about it, and draw from every source.