Hey everyone. I hope you are all having a decent night. I’m sure someone could have thought about or done this at some point but I will throw it out there anyway. Has anyone thought about taking some kind of paper media such as office paper or a thinner cardboard and creating black templates for the desired shape, whether it be for look reference or to use as a template? The great thing about that though is it is not permanent yet. You could adhere those shapes after being cut out to your mask for reference (most likely some kind of tape) and you could always change them until the big decision. Please keep in mind if you use a marker, make sure it is removable if it helps. This is only hypothetical but it would be great if some of this helped. 
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I’m sure someone else has tried this, but speaking from my experience the problem was this: when the mask folds and bends the paper moves and it’s nearly impossible. I like you’re thinking though! It’s always helpful to have thinkers and innovators around 
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I thought of a similar idea, but instead using resin to make a “shell” that goes over the mask, but had the eyecuts cut out to make a template. Similar to this, from child’s play 2:
Hell, I even considered making sharpened outline cutters, like a hole punch but Myers eyecut shaped 
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This technique has already been perfected. And it does work perfectly when done with the correct materials.
I’ve done that with my Rubie’s H4 mask. It seemed to work pretty well, but I have to agree that the mask stretching could have an effect on how they turn out when worn.
If you made the sculpt already and its ready for molding, you can make a seperate mold of just the eye/brow area w/ the eyecut guidelines
So the mask doesnt deform and move around you have a vacuform copy of the eye area, put it ontop of the latex mask and trace the lines.
Same as the chucky picture above