"Up to something" emoji!

Hi! I'd like to suggest that a new "up to something" emoji be added, please :)

You know, like that new moon face from WhatsApp! (link to the image is provided below)

https://www.nicepng.com/ourpic/u2q8w7t4e6u2e6y3_emoji-emojis-ios-ios11-moon-whatsapp-blackmoon/ 

It could be the moon itself, or even better, an actual yellow traditional emoji just like the others, but looking to one side with a light smile, as if really up to something.

Does that make sense? :)