A grin, probably.
Scowl
nothing Scowl
The girl had a nasty scowl on her face when she did not get her way.
The scowl on his face convinced me to not press any further into the matter.
Either one or two, it depends if you pronounce it as scowl or as scow-wel.
The big dog seemed to scowl at me.
IT IS A VERB:when your frownig. IT IS A NOUN:when your have a temper.
The teacher scowled me when I stole a toy from the toy bin.
frown
of Scowl
why are you scowling
A scowl is a facial expression that can be liked to someone who just bit into a lemon, and is angry about it. That's a scowl. "wearing a scowl" means going around with such an expression on one's face.