You may not need to create a new group. Try this. Select the eye. From the Display style pallet drop down menu, select "Element Style". Choose "Smooth Shaded". If desired set the 'Specular_Value' to zero, and change the colour of the Iris material. Of course the eye is no longer in true cartoon style, but you may think it looks OK.

The above example uses V3, but I think Aiko3 works the same.