I am creating a simple character that I want to use to show facial expressions. I don't mean anything spectacular as I am a newbie, but I do want to try and show surprised and sad emotions.

I have created the rest of the character from one polygon and I am wondering if I should stick to this rule with the eyes, mouth etc?

The reason I am wondering this, is I am unsure how the face moves when being animated? Is it best to have separate polygons for the eyes/mouth which are then 'combined' to the main character? Or keep everything as one single polygon?

Thanks in advance for advice...