In the interest of full disclosure, I only actually did this one fingernail this way. The others are more typical quick-nail-pen-on-color.
I’d expected this to be about as tricky as it was, but I’m still not sure how to get the eyes how I’d want them. The nail pens sadly lack a green or amber option, and trying to use a regular polish applied better than I’d expected, but wasn’t nearly bright enough (and I don’t have any bright green or amber nail polishes, either). I think next time I may do a white base, and/or silver for the eyes.