This is the start of a possible still life drawing that is needed for a demonstration. I always love the line drawing part best. I love the clean simple shapes and there is always the fear that adding values will change it into something that I won't like. Of course the values will give it a different illusion, and that is always interesting too. It rarely becomes something that I dislike, it just changes it into something different.
But I still love line drawings.
I do most of my drawings freehand and only use a grid if I really really have to get a perfect likeness. It means that I have take more measurements and really observe carefully to ensure that proportion is correct. There is no shame in using tools to help achieve the final result. A grid or even tracing simply provides the framework for a drawing. Its down to the artist to make it all come together.