You can at all times undo your edits by urgent ctrl+Z, so there’s no want to fret about accidentally messing up the video. Without music, your video will appear to be a glorified slideshow. Most viewers shall be so thrown off by the lack of audio that they’ll play another video to see if their headphones are working properly. At the very least, you want to edit the pictures for any exposure issues. The key things to pay attention to are colour, contrast, and saturation.