
The image tells us that fair trade is supporting people in third world and developing countries. The african woman shows that it's a quite poor area and the cocoa beans around her tell us that it's not England, and that it's a different location. The fact that they are using Cadbury's it will get more people to buy it because Cadbury is a big chocolate company and it's well known.

The message on this image is not that obvious because there is just a logo, the name of the charity, and there isn't any images. This image is not going to stand out to the audience, especially if they don't know what 'Oxfam' is.