Where's Waldo--er, Alfred?

Of course you know, Alfred Hitchcock liked to make cameos in his movies.
Here he is, posed as he is found in 25 of his movies.
Not sure if this graphic is helpful for spotting him or if it takes all the fun out trying to find him. I'll let you decide.

But wouldn't it make a great poster?

Clicking it makes it bigger.

found here.