This work proposes an authentication scheme that could substitute Personal Identity Number (PIN) based on Passfaces technology. The scheme permits users to select pictures of their choice as their PIN. Unlike the conventional PIN system where users are restricted to using a PIN of size 4, we evaluated our proposed scheme with 4, 5, 6, 7, and 8 pictures. The scheme achieves a 91.29% effectiveness score, atime-based efficiency of 0.09authentications s-1, and overall relative efficiency of 66.84%. We found that a 4-picture password is the most usable with an efficiency score of 0.12 tasks s-1