The Face in Plant 17v

[davidjackson]

Sadly, it could be something as simple as the scribe finishing off the drawing and amusing himself by drawing it like a face when he realised it was going like that anyway.

Mind you, if you look at the 'tongue', there is an intentional bulge on the outer line. Accident? Intentional attempt to depict the tip of the tongue?
Also, what's that pencil like some at the end of the tendril?