Simplistic Painted 3D "Following" Resin Eyes
Normal option is metallic color all the way around the pupil evenly, and the reptile style has the veining sort of pattern.
3cm 3D = 1.5cm deep
3.8cm 3D = 2cm Deep
1.75" 3D = .875” Deep
2" 3D = 1" deep
To give these eyes a following look, add eyelids. Once they have eyelids, they'll follow.