Casino game thumbnails should act like profile pictures by focusing on one...

https://emilianosexcellentcolumn.scriblorax.com/posts/why-do-players-remember-the-character-but-not-the-game-name

Casino game thumbnails should act like profile pictures by focusing on one clear focal point to grab attention quickly. On small screens, cluttered images lose impact, so use strong contrast and tight cropping to make visuals pop