What type of picture?
one of yourself?
one of Toontown?
For one of yourself go on photobooth and start snapping away.
For Screenshots-
Quote:
Command-Shift-3: takes a screenshot of the screen, and saves it as a file on the desktop.
Command-Shift-4, then select an area: takes a screenshot of an area and saves it as a file on the desktop.
Command-Shift-4, then space, then click a window: takes a screenshot of a window and saves it as a file on the desktop.
Or if you prefer to copy it to the clipboard, you just throw the control key into the mix.
Command-Control-Shift-3: takes a screenshot of the screen, and saves it to the clipboard.
Command-Control-Shift-4, then select an area: takes a screenshot of an area and saves it to the clipboard.
Command-Control-Shift-4, then space, then click a window: takes a screenshot of a window and saves it to the clipboard.
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^^Credit to AnitaNap for saving me the time of having to type that out.
I usually use Command-Shift-3&4 for when I play Toontown or online games.

To upload them you can use the
gallery or an
approved hosting site
Here is a guide for uploading photos into the gallery