Here’s me, being a Cambion, being interested in Medical Things (Photo by Kevin Gill)
My silver is snazaroo, but with eyeshadow applied on top for a bit of contouring/depth. I have it a tad darker around the eyes, for example, because that’s what my skin does anyway. Before I progressed to the silver, though, I had labyrinth marks on the left side of my face. I found a NYX eyebrow pencil that matched the colour of my freckles almost exactly, and that resulted in the lines looking pretty natural.
Lightweight horns are your friend! I made mine myself from EVA foam and I get loads of comments about how light they are (just a fraction of the Mandala ones, I gather). I have the headband lined with some cheap felt, though, because even though they’re light, the foam against my head was pretty uncomfortable at my first event. Since then, they’ve been fab. Never had to suffer from horn rot.
I have labyrinth marks on my hands/forearms too, but as they are literally drawn on with permanent marker, I’m not going to recommend my own method. My hands tend to have some sort of dye on them anyway, so my skin is used to that sort of nonsense. I would never use it on my face. If you are considering that sort of thing because it might last longer than makeup, please, please, try to come up with an alternative!