IMHO the current preview icon has an inconsistent aesthetic with the other icons (lines too thin) and unintuitive symbolism (why is the eye inside a square? I get that it’s supposed to represent a window, but does that aid the visual metaphor? The main feature is the eye, and it is too small.).
So, I propose using this instead: public-domain-icons/dist/symbol eye pupil big brother surveillance.svg at master · apancik/public-domain-icons · GitHub
Cheers!