Eye Render

Hi friends,
I'm trying to improve my skills, or to be more precise, develop any skills at all in the realm of digital 2D. So to start my process off, here is a painting of an eye, which you hopefully guessed.
This eye render is based on a very helpful tutorial by Hanimasyon Burada: https://www.youtube.com/watch?v=OFPBXqkmRyA
I'm just starting out, so please let me hear your critique on what parts I fucked up :D
Have a good one!