Well... the difference between photos and 3D-images are huge :) When photographing, you wan't catch something extraordinary, some special, almost unreal! In 3D it's a different story. You want to make it look as realistic (not always but often :)... Strange :) Well.. Ibaneze : You've managed to create HDRI, but to me, HDRI isn't the key to photorealism. Your image looks fantastic, but not photorealistic. Something's missing.. Well.. It still looks great! :)