I keep a small two and a half gallon aquarium around for just that reason. It has a clear bottom so I can look from underneath and see how a fly looks.
It's amazing how many fly company's parachute flies are tied with a post so tall it can be easily seen by the fish. I have to admit I used to do the same thing. Granted the taller post makes it easier for us to see the fly when fishing it, but it's all about the fishes view, not ours.
fish or DIE