Now its not the face is the important (an ex-minister of Hungary) but the are bordered with yellow and the logo pinpointing the "mouse-over-popup" (you put your mouse over the blue area and pops up the) logo. This happens when one has a "semi-Anonymous" viewer visited your profile.
Check the image bellow:
So, the main characteristics of the viewer will be shown. At the top image, I coul see both the logo and the name of the Linkedin Company Page.
I have clicked on the logo, arrived to the Company Page and realised, that I don't know anyone from that company, so I connected 3 of them...
Who's viewed your profile is my most favorite gadget, feature on Linkedin.
When you arrive on Linkedin you find the menu bar on the top. The second menu is a drop down menu, (click for it on tablet) where you can find two sub menus, the "Edit profile" and the "Who's viewed your profile".
I start here with "Edit profile".