You never know who will come callin when you open a door.....
Reading this thread makes me think of this.......
When you dream....no matter how pleasant or downright scary.....you have no choice except to keep dreaming until you wake up.
With scrying....if you see something unpleasant or something that makes you feel uneasy...simply stop and put your scrying tool away.
And when you really think about it....what's to keep an image from starring back at you when you look in the mirror everyday?
I'm not sure if "eyelid" scrying is always done with intention or if this would be considered "eyelid" scrying but every night when I close my eyes I never know what to expect. Sometimes I see nothing but black. Other times I see colors, faces, animals, patterns, scenery. Recently I saw a huge spiderweb and the spider moved out to the center of the web. And if I open my eyes the images are gone.
I do agree that not all forms of divination are for everyone and if something makes you uncomfortable it's better to simply not do it. There's more than one way to receive information : )