Ok, so let me see if I get this straight....

Your password is a sequence of pictures that the user chooses? These pictures are stored on the hard drive of the user, and all are of the same format...? If this is the way that the system would work, I think I see a small problem: anyone who was able to break onto the usres hard drive would be able to search for all the image files that fite the pparamaters of the password scheme, and then uses those in a cracking program to break this password. I think that this would severly reduce the nuber of possible passwords, and make it very easy for an individual dto break the passowrd. Almost like having a dictionary on the hard drive from which the pass "phrase" must come from...

I could be completely off on this....