For all you first years pondering the art of composition, give Roger Deakins another watch and see just how well he auteurs each shot. Truly one of the masters. Rule of Thirds, Leading Lines, Balance, Symmetry, Framing...it's all there.
His IMDb page shows possibly the best range of cinematography work out there. And for an example of his work in full, check out The Assassination of Jesse James by the Coward Robert Ford.