Drawing - #2 - Attempting to visualise a human skull

So, Getting back to were we left.
I decided to draw each part of the skull in 3D separatly and fuse them later.

Instead of trying to do the skull as a sphere, I decided to trip down the sphere into a simpler geometry. Like this, can someone tell me what's it called in English?


Then, I tried to imagine that in 3D. After spending some time. Working on this;

Figured I was imagined it wrong, So I drew it like this and then Ireimiagined the chin and skull + Simpifying it;

Now, I just have to work on adding the chin in 3D; Meanwhile, have some fun sketches I drew around the paper!