There are several ways that you can transfer photographs from your PC to your iPad.
(1) You can synchronise your iPad and PC using the iTunes software on your PC and you can select which photos/albums/folders that you want to copy.
(2) If you only have a few photos to transfer, then you can email them from your PC to your iPad
(3) You can use a third-party app, like GoodReader (see it in the iPad App Store) and that will allow you to copy photos from your PC to your iPad either using WiFi or the USB connection cable that came with your iPad
(4) You can use a 'cloud storage' server, such as Apple's MobileMe iDisk or DropBox to transfer photos from your PC to the cloud storage and then you can download them from the cloud storage to your iPad. If you need to know more about cloud storage have a look at the Apple iPad website and look for MobileMe.
(5) You can use the optional camera connection kit - this will allow you to transfer photos either from an SD memory card directly to your iPad or you can plug the connection kit directly into your camera and upload photos that way.
If you need further details about transferring photo from PC to iPad, just refer the next tutorials.
How to transfer photo/pictures from iPad to PC
How to transfer or backup photo from iPad to Mac