Additional Profile Images
Additional profile pictures should be included to help tell the story of who you are as a person.
For example, if you like to shop with friends, upload pictures of you shopping and having a blast with your friends.
If you like fishing, upload some images of you on the bank or in a boat with a recent catch.
The point, if someone were to look at 5-10 images of you on your profile page, what impression would they be left with?
If all your pictures are with someone, it may show insecurity. Conversely, if all the images are of you by yourself, one may conclude you aren't very social.
Use images to tell a story about you. Most importantly, have fun telling the story.