How do I keyword an image on Google plus?

Selected answers from the Dumb SEO Questions Facebook & G+ community.

• 
  Mike Weeks: Key wording an image on my blog gets it featured in image search, how do I keyword an image on Google plus?
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  Elena C: You keyword your image for Google + through three lines maximum of quality, eye catching writing.  ;Basically, think of the three lines of writing as the accent, as well as the messenger to get others to see your keyword image.  ;
  
  You also keyword your image via the hash tag feature within Google + For example #socialmedia  ;is a hashtag that gets more viewers to see your post which helps greatly in its SEO.  ;Also, if you keep it short and sweet, i.e use a call to action within your text that has about two or so hashtags, you will be golden.  ;
  
  I hope that you find this answer to be helpful.  ;
  
  Elena.  ;