This is a 3D skull that I created about a month after I started playing minecraft. I hadn't started using any tools like MCedit or InvEdit at this time. I did use Minecraft structure planner (the first tool I ever used) to help with the planning. I took a 2D image of a skull and used the planner to help size the skull. Other than that it was all natural and took about 3 hours to build not counting the mining and creation of stone.

I had this skull placed on a small island on my first world, which unfortunately got corrupted. I was able to save the skull though.

Skull dimensions are 33W X 25L X 27H

Enjoy!