I am thinking of starting a movie/entertainment blog. It will obviously include celebrity news, movie and music reviews. There are a couple of questions that I would like to ask...first, in the long run it will obviously make sense to create a database of images but I don't want to spend a lot right at the start on images. What I am thinking is..is it perfectly legal to use images that the production studios themselves release when promoting a film? For example, if I am going to write a review of Die Hard 5, can I use the poster/first look of the film that was released or even the photocall images? Obviously I cannot use a film image from a few years ago for current news items (unless they are free of course). What about wikimedia commons? Or from Yahoo Movies or IMDB and below the image specifying the source of the image (with or without a backlink)?