Your own pictures
Uploading at Wikimedia Commons is preferred since it saves Hitchwiki bandwidth and the pictures can also be used on the many projects that are part of Wikimedia, such as Wikipedia and Wiktionary.
From Wikimedia Commons
We prefer to have pictures that are somehow related to hitchhiking but it's nicer to have some picture than none. Once you have found a picture at Wikimedia Commons it's title will look like File:Some Filename.jpg. You can simply copy that and add it as [[File:Some Filename.jpg]] on any page at Hitchwiki. You can also do fancier things like [[File:Some Filename.jpg|thumb|300px|Description]].