On Samsung Galaxy S3: Settings, Accounts and Sync, select gmail account associated with your phone, then
uncheck sync google photos and sync picasa web albums, etc.
make sure you have "keep phone synched with google" checked when you are adding account to phone will remove pics and keep up with changes you made to picasa and gmail photos online. (I had to go into Picasa and delete those photos I didn't want showing up on my phone.) Hope this helps!