How do I make facial expressions?

Hello, I just want to ask how to make facial expressions like this:

when you’ve got a rig like this:

Your head is just a cube so you would need to add more geometry to model the actual mouth and eye etc that you can then animate it either with bones or shapekeys.
Otherwise use an animated texture to animate the appearance of mouth movement.

But how do I make the smile more curved?

I tried subdividing it and it looked kinda blocky.

Use subdivision surface modifier with edge creasing (Shift+E) to keep sharp edges sharp. Then use smooth shading (option in toolshelf). The level of details is really dependent on what you want to do with the model

Quick model with shapekey for on/off smile


head.blend (94.6 KB)