Captions Wikipedia:Manual of Style

mos:caption

photographs , other graphics should have captions, unless unambiguous depictions of subject of article or when self-captioning images (such reproductions of album or book covers). in biography article no caption necessary portrait of subject pictured alone; 1 might used give year, subject s age, or other circumstances of portrait along name of subject.

formatting of captions

captions start capital letter.
most captions not complete sentences merely sentence fragments should not end period. however, if complete sentence occurs in caption, every sentence , every sentence fragment in caption should end period.
the text of captions should not specially formatted, except in ways apply if occurred in main text (e.g., italics latin name of species).
captions should succinct; more information can included on description page, or in main text.
captions technical charts , diagrams may need substantially longer usual; should describe elements of image , indicate significance.

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