it's simple.
1. in your PC create folder "pictures" (or whatever you like)
2. in the "pictures" folder create another subfolders (like "cars", "family", "babes"...)
and copy all the pics to those apropriate folders you want to have in iPod
3. connect your iPod to your PC and start iTunes
4. click on your iPod in iTunes and select the "Photos" folder in iTunes
5. there is possible to choose the folder you want to be in your iPod. I recomend to select the "pictures" folder, so anytime you add pics to that folder, it will automatically update them in your iPod after connecting to iTunes in the future