To delete a Now or Then profile photo, click your name/photo in the orange bar at the top of any page, go to My Profile and select your Now or Then photo. Click Delete and then Delete again to confirm.
To delete an album photo or a tagged photo, go to My Profile and select Gallery. Scroll to the Photos area and click Album view. Click view photos of the album you wish to remove photos from. Find the photo you want to delete and click the trash can icon, then click Delete to confirm.
If you'd like to delete an entire photo album you created, go to My Profile and select Gallery, then Album view. Find the album you wish to delete and click View photos, then Delete Album.
Note: The only profile albums you can't delete are your default named album ("Julie Smith's Photo Album," for example) and your album of Tagged photos. To remove those albums from view, simply delete all of the photos they contain.
To learn how to delete a Facebook photo album, visit How do I share (or not share) photos I've posted on Facebook?