Very impressive! It looks like it took a long time to draw. Not bad in an hour and half!
A couple things that might make it even better:
If you have photoshop, you can mess around with the brightness/contrast feature to darken up the pencil lines and get rid of the smudges. Then, if you want, you can color on a layer underneath, and that may help the clarity of the picture so it's easier to read. Just an idea.
One thing that would be really cool to see is if you added a bunch of people--like "Where's Waldo?" except Disney style.