Questions about iconography...

[Prodigal7]

What about the "Holy Face" icon? I've never seen this one specifically put out for veneration, but there is one in one of the side rooms at my church.
View attachment 356440

One other question on proper veneration, several weeks ago we had an icon with around five saints on it placed in the middle of the nave for veneration. It had a unique feature I hadn't seen before: below each saint's feet was a kind of metal "button" that protruded from the surface of the icon. I noticed a lot of variation in how people venerated this icon - some kissed all of the buttons, some kissed all of the saints' feet, some kissed only one saint's feet. What's the proper thing to do in a case like that? Are the buttons standard on some icons to prevent the paint from getting worn off?

My grandmother gave me an icon of the icon “not created by human hands”. It’s one that I treasure. It feels like Jesus is looking right at me as I pray.