Sometime when you share a link on LinkedIn, it gives you something add for the choice of pictures to display to the left of the article. That this job posting for example:
LinkedIn and Facebook using Open Graph to decide which photos to use. Open Graph lets web pages become meaningful objects that make it easy for other things to consume it.
A page implements Open Graph by adding a bunch of html tags in the header. For example:
<meta property=”og:image” content=”http://ejbantz.com/wp-content/uploads/2013/12/xend.png” />
With the og:image meta tag there, LinkedIn now knows which image is appropriate for the page.
LinkenIn still has some additional requirements that the image needs to meet in order to qualify to be displayed, like it needs to be at least 80×150 pixels. Details can be found here:
More information about Open Graph can be found here:
So if the page you are sharing does not have the images you would expect to see, check the page source to see if it has the og:image meta tags.