The following sites should help you to craft a review that scores highly!
http://www.bfi.org.uk/sightandsound/
This is the website of Sight + Sound magazine-- your style model. Look through the archive at several film reviews to get a 'feel' of the house style.
http://www.imdb.com/Glossary/
This is a huge glossary of film terms-- the sort of references a film buff reading S+S might appreciate. Search it for half-remembered words and phrases, or to find la mot juste for describing a feature of your chosen film.
http://academic.sun.ac.za/forlang/bergman/tech/glossary/ebert_glos.htm
This is more tongue-in-cheek-- Roger Ebert is a long-standing film reviewer in the United States, and this site outlines some of his (rather cyncial) terms for film conventions.
http://ks.essortment.com/writingfilmrev_ralk.htm
A general guide for writing film reviews-- some advice for what aspects of the film to note when viewing, etc.
http://www.aber.ac.uk/media/Documents/short/gramtv.html
A good visual guide to the technical language of shots, angles, camera movement, sound, etc. A must for Dennis the Menace fans!
