On a phone, a manga page and a casino screen compete for the same scarce space:...

https://cruzinnp079.tearosediner.net/what-are-the-most-common-small-screen-mistakes-in-illustrated-interfaces

On a phone, a manga page and a casino screen compete for the same scarce space: your attention. Strong focal points guide the eye, readable controls prevent squinting, and smart contrast keeps details clear without clutter