Which is more important - the look of a gunging or the feel? How many of us self-gunge without either a mirror or a camera?

It's not an either/or question. Good gunge, to me, has to maximize both the best look and feel.

Both. As for look, I’m more into dirty-looking stuff (chocolate, PB, fluff, nutella, etc.) but if it’s really colorful, I at least like it to be really thick and not that cheap-looking translucent stuff