Thanks, amandagirl. I actually looked online for a diagram of real human eyes and "kind of" figured things out that way, although there was some trial and error. I think I've got M4's eyes looking as good as I've ever rendered them here:

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3