Photos are a great way to show about what you're talking.
If you want to add photos in the Visual Mode you can click on "Photo" in the right rail. Now you'll go to a screen where you can upload a new photo or where you can choose a photo which is already on the wiki. After that you go to another screen where you can add a caption, change the size and choose the alignment.
If you want the same layout as the photos added through the Visual Editor you can use the following code:
If you only want the photo without a caption and thumb you can use the following code: