From the Home screen, tap Gallery .
or from the Home screen, tapOR
Open Gallery from the Camera application by tapping the thumbnail image at the bottom right corner of the screen.
The Gallery application presents the pictures and videos saved in your phone, including those you’ve taken with the Camera application and those you downloaded from the web or other locations.
If you have a Picasa™ account synchronized with one of your phone’s Google™ Accounts, you’ll also see your Picasa web albums in your Gallery.