when your iPod is connected to the computer, click where it says the name of your iPod on the left.
Then it shows you a screen with all the free space on your iPod, how much your music takes up, etc.
at the top there is a series of tabs. one of them is "photos". click it
under that tab, you can choose what folders to sync with your ipod
with photos, you can't drag and drop like music
you have to sync a whole folder to the iPod
in other words, make a folder and put the pictures you want in there, and then sync it with the iPod.