Being as I can't draw worth a lick, but am decent at alterations I would have to agree it's rather low quality. You have to pay attention to pixel stretch and shadows if you want it to be convincing... or just go with a rediculess original like
http://www.farangdingdong.com/
which before I get flamed I know has likely been put up here hundreds, ney, thousands of times. I'm just listing it here for comparison purposes