i found this

Why It Doesn't Work

• The thumbnail is a cluttered screenshot with too many small, unreadable text elements.
• The main subjects are small and lack visual impact, especially on mobile screens.
• The image fails the glance test; it's unclear what the video is about in 2 seconds.
• There is no clear focal point or expressive element to draw the viewer's eye.
• The composition is visually unbalanced with too much empty space at the top.
• The thumbnail doesn't create any intrigue or curiosity to complement the vague title.