How to Maintain Eye Contact?

So me personally I like keeping eye contact it lets them know you are listening but if you don't want to make eye contact then do it ever so often but while they are talking nod your head to let them know you are listening. I get this way when I make eye contact with my crush but not really my friends

Look in between their eyes

I like to look into people's eyes. But not as a person staring at me. But just like as an object. The eye itself. I like to look at it like art. Because the color and the way it's shaped is so pretty and interesting. So just admire the color and pattern in their eyes as a piece of art. Not as a person staring at you