If the picture is copyrighted (and 99% of them are) then you need the permission of the copright holder to use the picture.
That being said, there is also something called "fair use". This means that you are allowed to use material (including part of a page from a book, part of a song, a short video clip or a picture) when doing a review of the item. You are doing something that is of benefit to the copyright holder and that will hopefully make money for them (assuming it is a favorable review). So normally you will not get a complaint if you use a picture in a review. And you may have the legal right to that.
If the picture is from a movie, you can usually get away with it. If the shot is a professional "head shot" of an actor, director, etc, you can not. That is not part of a "review", but rather is a work of art owned by the photographer.
If the copyright holder holder objects, they are required to notify you in writing (which can be an e-mail to your site) and normally have to give you a reasonable time period (usually 72 hours) to remove the image before they can take legal action against you. If you remove the picture within the time frame, they have no legal grounds to sue you.
It is a tricky area, and one where you have to be careful. But generally if you are not misusing the image, you will not get an objection to its use.