The number one top for making videos look professional on YouTube actually has very little to do with your eyes. Having a video that has good quality sound is the best way to keep people engaged in your YouTube videos. In addition to getting a nice mic to record audio for your YouTube videos, you should consider getting a tripod so you can stabilize the camera that you are shooting footage with. A set of continuous LED lights can be a nice addition, but if you are staring on a budget filming near a nice window covered in a soft white curtain can serve as an impromptu softbox—you will just need to make sure you are filming your content during the daytime to achieve a flattering look.