Have you done image planes before? They can be a bummer sometimes mate.
I would suggest going back to PS....put them on the same panel in PS but on different layers. Edit with 'Transform" or "Free Transform' after you put some rule lines on at least the side view. Make sure they all line up nicely together on their respective layers.
Then save each layer but take note again of the image size. If they are all seperate photos you will have to copy and get them (in 1 project) and do as in the first part above. Sometimes the images are slightly diff in size etc etc.
I think there is a tut in SM somewhere for image plane setup?? some one else may know where...or just try and have a look. Probably in the archive
hope this helps
Edit: by the looks you have done it quickly..there are ways to get a nice neat pic of every layer...unless you couldnt be bothered (assuming you are fresh at PS..no offence meant).
"A Darkness at Sethanon", a book I aspire to model some of the charcters and scenes