Good guess at what Madara Uchiha may look like under that mask. Unfortunately, Kishimoto has only revealed 1/4 of his real face to us. So going by the wrinkles, creases, or scars on his face what ever you think they are, you made a good guess. Hopefully it won't be to much longer until Kishimoto reveals Madara's whole face.
Yes he has a head too long, In my opinion Madara was seriously wounded during his fight against the first hokage because part of his face bandaged under the mask and he has only 1 single hole in the mask ... So one Eye?