Jo_Ann,
You definitely got the first floor right. How?
The second floor is supposed to be a 4/12 on the back side with 12/12 on the 2 ends of the second floor and a 3/12 shed dormer look in the middle. In the picture, the far end and middle section of the second floor are correct but the end closest to you should be like the other end. Extend all the way to the front wall.
Thanks,