Style has to do with the choices that a writer makes in his work. For the most part, style comes naturally. It is something that is enhanced and fine-tuned over the course of many works--the more the better. I think that style may be somewhat of a conscious thing; writers are aware of the decisions they are making, but a lot of it comes naturally.
When talking about writing, style would obviously have a lot to do with word choices. So many different words can be used to make a point and the fact that those words are chosen at the discretion of the writer helps define his style. Using those words to elaborate on a subject also means choosing a direction in which to approach that subject. "Recount the process of creating a 3-panel comic" can be a task that some writers choose to do step-by-step, or out of order--while jumping from point to point. Essays are different in their formatting, as well as the more obvious word choices.
Through writing multiple essays for this course and reading other people's essays during peer review, the issue of different styles is reiterated. Just as reading several works by the same author reveals their personal style, going through drafts of a classmate's essay makes it evident that though the essay has been revised, it is still written in the same style. There is a constant mood that is set by the writer that his reader can feel.
In writing for this class and reading the material, I have thought more on the subject of personal writing style than ever before; I thought more about my own style in one week than I ever had. I have learned that style is something that should be encouraged, as long as it does not overlap into the territory of what is supposed to come from the essay. Certain points must be made and guidelines must be followed--it is how those guidelines are approached that defines a writer's style.