I did a google image search for
creepiest clown ever.
The 'evil' looking ones tried too hard to look scary, which automatically makes them not scary at all. The most unsettling ones are the clowns that look just a bit 'off':
I think they're scarier because their intent is unknown, and the fear of the unknown is stronger than the fear of a one-dimensional, obviously evil murderous clown from hell.
Let's hope the creators of this remake realize this.