An inference is an educated guess based upon an observation.
Teen Ink Inferences
"I was never in love with vampires until Twilight came out. I didn’t know it was possible, but Stephenie Meyer changed the stereotypical blood-sucking vampire into a beautiful god-like creature."
From this review, I can infer that the author is pleasantly surprised about the Twilight series characters and plot. She enjoys reading these books and is in love with this new characteristics of a vampire.
"The book was very intriguing from the very start to the end. The plot line was unique and kept me reading."
According to this book review, I can infer that the author enjoyed reading the Divergent series and wants to read more books written by that author.
"Though I usually prefer science fiction and fantasy, reading The Outsiders was a phenomenal experience."
According to this book review, I can infer that the author was surprised about how great The Outsiders was. Also, the author might want to read more books similar to the Outsiders.
After looking at this image, I infer that Homer is nervous or scared about something that he is looking at. Also, he seems worried and stressed.