Challenge: Only a true genius with 20/20 eyesight can spot the only difference in the image

A captivating optical illusion has taken social media by storm, as users attempt to spot the lone difference separating two dapper gentlemen in suits. While many focus on their facial expressions and clothing, but what is the key variation?

Challenge: Only a true genius with 20/20 eyesight can spot the only difference in the image
A captivating optical illusion has taken social media by storm, as users attempt to spot the lone difference separating two dapper gentlemen in suits. While many focus on their facial expressions and clothing, but what is the key variation?