Can Anyone Tell Me....

why when I post photos I cannot double click on them when I enter the website from http://sixboysandalittlelady.blogspot.co and have them enlarge? Is there something in the way I am loading the pictures? Everyone else's pictures on other blogs can be clicked and enlargened. I don't want my faces so small so want the option to enlarge. Thanks! You can reply on the comments if you are a technical genius!!