Board Thread:Support Requests - Getting Technical/@comment-5112176-20130612163102/@comment-5716479-20130612222403

To add image you add this: (col span because you want it to span over both columns, like the title) To make it optional you check if image has been passed before constructing the line, the | part create the pipe symbol(|) inside, so that we don't confuse the IF which use it as well.
 * colspan="2"|
 * colspan="2"|

you can find a more advanced example in your Category:Infobox_templates and on Rappy blog, but IMO you don't need more than this.