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Overview
From [1], there are many types for markdown image.
Inline & Reference are the two style for image in markdown.
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Inline Image
An inline image is a graphic image that is inserted into a web page to add visual appeal, provide information or to represent a hyperlink.
In its most common vernacular, in-lining an image is when you place an image tag inside of another block level element such as a paragraph.
Picture of Duck: 
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Reference Image
Picture of Duck: ![Duck][1] Same picture of Duck: ![Same Duck][1] [1]: http://i.stack.imgur.com/ukC2U.jpg
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Reference