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Hi @isabelpena. I just thought a proper definition of the word grin is in order. This is from the Oxford Languages definition:

Grin - verb
smile broadly, especially in an unrestrained manner and with the mouth open.

Example: "Dennis appeared, grinning cheerfully"

Similar:
smile
smile broadly
beam
grin from ear to ear
smile from ear to ear
grin like a Cheshire cat
smirk
be all smiles
As a noun it means:
a broad smile.
"“OK,” he said with a grin."

Just wanted you to know that grin is not always associated with the crooked and the evil and the bad. Only sometimes as in a smirk or a grin of a Cheshire cat. But normally it is associated with a good and happy mood as in a broad good natured smile. It really depends on the usage.

Thanks for clarifying my doubt @gems.and.cookies, now I have more knowledge of what to do in the contest. Grateful.

My pleasure. Good luck with your entry.

grin is a crooked, evil, bad smile with teeth, smile of an evil person

ok. Gracias por la explicación. Buscaré algo de eso a ver qué encuentro.

:=) my pleasure! now you added one more English word to your vocabulary, right?

That´s correct friend.