Ideally the hoof and the pastern should be at the same angle. If you see a minor difference you needn't worry too much. Simply ask your farrier about it at the next visit if it bothers you. While you are looking from this position, look for any dishes or flares at the toes. Ideally you should see straight lines on all four feet.
Minor flares are usually ok.
Major flares could be a sign of a problem. Farriers have been doing this on hind feet for over 100 years. There it's called a square toe. If the wall is straight at the toe, and the shoe is set back, the excess toe hanging over the shoe should be beveled off neatly. If it has just been whacked off with a rasp or nippers and looks really sloppy, this might be a clue to the quality you are getting from your farrier.