Casino game thumbnails should behave like profile pictures because both must...

https://wiki-tonic.win/index.php/How_to_Design_a_Casino_Thumbnail_Around_a_Mechanic,_Not_a_Character

Casino game thumbnails should behave like profile pictures because both must grab attention on small screens. Focus on one clear focal point to avoid clutter. Use strong contrast to make details pop. Crop tightly to highlight key elements