We tend to forget that when we talk, more of the information we relay is presented in the form of the facial and body movements. We don't really listen to the one speaking, we watch them.

This is the fundamental difference between writing and talking, and the reason why it seems so deceptively easy to write (anyone can do it!) and yet is so incredibly hard (why does everything I write down sucks?).

Writing is not the same as talking.

In writing your job is to show the reader what they can't see...