To make your anime character look like they are in love, replace the eyes with two rounded hearts. Remember to add highlight to the corners to create a better effect.

A happy expression in anime uses two thick curved lines for the eyes and a wide mouth to create a happy, laughing face.

An annoyed facial expression can be made by pointing the eyebrows down towards the centre. The eyes use a thick line with a semicircle underneath. The mouth is slightly curved.