https://i.ytimg.com/vi/r6p_e9ThK3U/hqdefault.jpg Blender is open source software; this tutorial shows how to model eyes in a character head model, it focuses on the eye sockets and is easy to learn and follow even for beginners. VscorpianC Blender 3D Modeling and Animation program can be downloaded and used freely because it is open source software. source