Thank you! All 50 was originally my goal but I ran into a couple of problems -- mainly that a bunch of states have their state name/initials on the signs and I don't know how to remove them (Quizmaster did it for this to be featured) and a bunch of them are just vague circles and squares. It would be really difficult to solve (but probably pretty cool, too).
Some of the states, like Massachusetts, have pretty unique ones. You might not be able to get all 50, but there are still some more that could be included.
What's sad is that the whole nose of the aforementioned Old Man slid off his face a good number of years ago now. It was such a popular emblem of New Hampshire.