Descriptive title and subheads
Infographics are mostly comprised of illustrations; hence titles and subheadings are short but concise as in the example below. Some subheads however, are written longer than others, depending on the context.
There's a reason for that "info" in infographics - informative data containing all the relevant facts and figures you need.
Bold, thematically appropriate colour scheme
Colours help define the theme and mood of any infographic, as discussed here.
And the trend in graphic design is flat illustrations, as they are easy to the eyes and very catchy.
Clearly organized, sequential story
Infographics are essentially visual narratives. It's nonsense to just put up numbers and whatever on a graphic without explaining what's going on behind, right?
Specially formatted facts
Key facts and figures are often highlighted or boldfaced, while pertinent quotes are in italics or quotation marks.