Image within a image

I used a eos cannon 400d to take two photo's.
One of me sitting on the floor next to a billboard 
and another of me just standing up so I can place it within the billboard.

I draged both photo's into photoshop.










I then draged the image of me standing out of the frame and draged into on top of the other image.

 

 I then changed the opacity so it was more translucent so I could see the other image behind so it was easier to line them up and shrink it.

I then selected the rubber tool and rubbed out the  part of the image that wasn't in the frame

 I then zoomed in so I could see closer to the frame and erase it with more procession .

I clicked on the outside of the frame and pressed shift so i could get s straight like erased around it and the edited the rest of the picture around it.

Final image within a image...