body: I run a film and TV show reviewing blog using the Google Blogger service.
  
  
  On this blog, I frequently use pictures taken from the film/episode/TV show that I am reviewing in the article.
  
  
  The pictures that I use are always gathered by simply using the Google Image search to find a picture that suits my need. As such, the pictures come from a large variety of sources, including others peoples reviews, promotional material and even frames from advertisements.
  
  
  Is the use of these images on my blog protected under Fair Use, regardless of the source of the original images? What about if I started earning money from my blog?
  
  
  
title: Using (presumably) copyrighted materials in reviews