Often you see that a portal has an image gallery of some sort. WebCenter unfortunately does not have an out of the box image gallery. Luckily there is some god news because it is not hard to create your own custom image gallery by just using the navigation model and the content presenter and a few lines of code.
Navigation models tend to be used to create navigation models... Hence the name. With some creativity we also can use the navigation model for other cool stuff like an image gallery. The advantage of this is that we can easily modify the content of the image gallery by just editing the navigation model.
All the content that we will be using is stored in UCM so we can just keep on using the features of UCM to have a good lifecycle of your images. You also can make use of the security of UCM so people can only see the images they should see.