Step-By-Step Instructions:
1. In Photoshop, open a photograph of a person who has a big smile showing all their teeth.
2. Goto Filter > Liquify.
3. The Liquify box will appear. Under Tool Options, select an appropriate sized brush. One that is not too big for the eyebrows.
4. Using the brush, click and push the eye brows down so that they appear to look angry.
5. If necessary click and push the corners of the mouth up so that the mouth appears to be grinning even more than before.
6. When you are done, click OK.
7. You should now have your evil grin face expression!
