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I can tell you are using the default visual editor when adding images to articles. It is recommended that you use the source editor instead. Use of the visual editor often adds several unintentional artefacts to your edit that are undesirable. The chief of these is that it is all too easy to put an image in the middle of a paragraph, or even the middle of a word, which can break wikicode and page structure.
While I'm on the subject of images, I may as well add that images should always be relevant to the text they are accompanying (i.e., putting an image of Neville from the Battle of Hogwarts in the section about his early life or an image from a film in a section discussing a video game is frowned upon, to point out some of your recent edits), and that captions, while they should be brief, should also be descriptive. -- 1337star (Owl Post) 23:38, March 17, 2012 (UTC)