you need a nice high-quality video! preferably not a music video - I find that this can occasionally distract from the song - but a video with high-quality sound. the best kind would be one with a simple image (preferably the album artwork) throughout the video while the song is playing. that way, it mimics an audio post. although if there is only a high-quality music video, that’s okay too.
make sure to include a little blurb about what the song is like! and why you like it! (please try not to leave that blank. if you do and I’m feeling particularly generous, I’ll take a listen myself and fill it in for you, but otherwise, I will probably reject your submission.)