I've been into graphic design for a long long time. And over the years I've went back and forth to more vibrant in detailed banners to very simplistic banners. I used to think that the Banner had to be sharp as can be, and pop out and show every little detail upfront. But here recently I've tried to do more minimalistic banners, that a nice and clean and organized.
An example of this is my current channel banner:
Which to me is very simplistic. The only thing really popped out on it is the glass lines.
But recently I did make a banner for one of my friends that is a little more complex than mine.
and it was one of those I kinda threw my hands up in the air on cause I wasn't too sure on what I wanted to do with it and I just tried multiple things and that's what happened.