@thecabbagedetective I’m not a gifted hand-painter, so I usually photo-reference textures like eyes. You could try searching unsplash.com or pixabay.com (for legally safe images) and either find an image that doesn’t have many reflections (clean iris texture potential) or remove them with photoshop / krita.
Alternatively you could try snapping a pic of your own eye with your phone camera. Just make sure you take the picture in a well lit area and try to orient it so there’s as little shadow and reflection as possible. Same photoshop / krita cleanup potential applies.
