AFAIK, php.ini does not have a "show graphics" or "show images" option. (A quick search for "graphics" or "images" returns nothing related unless you're doing dynamic images.) Whether or not graphics and images are shown depends on several things:
1. Browser setting
2. Validity of the graphic file (is it corrupted? Did you FTP it in the right mode?)
3. HTML source (are you using <img= tags?)

You can also try for
PHP's built-in default is text/html
default_mimetype = "text/html"