We learned.. When creating thumbnails the ones you overthink too much, are the ones that end up not doing as well for some reason!! As well, the clarity, expression, position, font, and colors in the thumbnail all make an impact. Also, being able to realize that maybe your thumbnail isn't good enough, and keeping trying to do different things. One big key was being willing to try something new, and learn new skills to keep producing thumbnails that are better and better quality.