My theme was rejected and all it says is low-quality, stretched, or blank. I was wondering what would be considered stretched? I found a pic on bing that I wanted to use mainly for a theme for myself and decided to mirror it (Have it normal on one side, paste it again next to the original and flipped it so it mirrors). I resized it to be 3000X200 but I do not know why it was rejected. Also is it required to have a footer? I did not notice it until I already submitted the theme but I left out a footer. Might that also be why it was rejected? Would just like answers because I am new to this and really would like to learn about it!
This is the image