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Syntax for images is like the syntax for links, with one difference. Instead of link text, we have an image description. The rules for this are the same as for link text, except that (a) an image description starts with  or foo <a href="/url">bar</a>. Only the plain string content is rendered, without formatting.
Reference-style:
Collapsed:
The labels are case-insensitive:
As with reference links, whitespace is not allowed between the two sets of brackets:
Shortcut:
Note that link labels cannot contain unescaped brackets:
The link labels are case-insensitive:
If you just want a literal ! followed by bracketed text, you can backslash-escape the opening [:
If you want a link after a literal !, backslash-escape the !: