This work started from a concept quickly done on a morning before going to work, it's probably some oneiric memory :) I cannot show it because I don't know where it has gone to, but the main idea is to represent something realistic which could never exist in the real world. This is the aspect of graphic computer I prefer: making unreality real.
I don't want to go into details, as the main aim of this article is to share the process which led me to the final render with the whole community of CG artists.
I started creating a very simple model made up of a face with strange features (picture 1), then I created another one representing an old man (picture 2). After that, I merged both models creating a third one.
I tried to keep a clean topology (picture 3).
Then, I copied a part of the old man face (picture 4) changing the features and making him younger; I had to add some other edge loops in order connect both meshes (picture 5).