I got an interesting comment on the 1 or 3 rough draft video and my other motion comics (Video Below) and it talked about how they felt the music overpowered the images. This is a very interesting idea as I felt that animation on its own would feel dull with no sound. With the music, however, it complements the animation while creating an opportunity where no sound effects or voiceovers are needed since the music works as the audio track.
If you want to post your comic book on YouTube my recommendation is to go ahead and use video editing software to show each panel in sequence and have background music to enhance the experience (making motion comics). If you have the skill or can afford to hire someone voice overs are always nice, but need to be top quality or else they distract more than improve the video. I feel