Just did, it worked pretty well. It reminds me a lot of Nintendo's thing where they automatically make a Mii based off a picture of your face, except better. If you don't like the sticker pack that was outputted, you can fix your hair or whatever and try again. Took about 10-20 seconds for the first try, only 1-2 seconds for the second try, so there's probably some caching going on. My only complaint is that it's not super intuitive how to actually get to this feature. You have to be in a chat, go to stickers, go to the add stickers section, and then it'll be in that menu.