Hi and welcome to my totally original idea that has totally never been thought of before!

Glowing eyes could be added alongside the existing eye shine options, with the glow color corresponding to whichever eye color you've chosen.

Similarly, the tattoo and makeup color palettes could have a checkbox added alongside the opacity sliders to toggle glow on/off (maybe you'd have to purchase the glowing effect from the gear market to unlock the checkbox?)

And on a totally unrelated note, an electric blue color option for eyes, makeup, and tattoos would also be nice. ;)