As you write you'll discover which parts you like best about your writing and you'll keep those and change others until you have a writing style you like. Some of this is probably subconcious, the various scratching out of awkward sentences ...
I very much agree with what TracyD was saying about the various influences. Who you are, what you've read will all change how you write.
Developing a writing 'style' is something that happens both naturally and with effort.