There are many benefits from commenting on works of art in the British Museum. The main one, of course, is being able to see the works themselves in three dimensions rather than trying to comment from photographs.
A further benefit is that the Museum allows you to use the images from their website for free, so long as you acknowledge the copyright of the Museum. I also found out that they will email high resolution images for you to use rather than relying on the lower resolution of the photos on their website. I took advantage of this service for a number of the images I have collected and commented on.