You must have at least the same amount of screenshots as the amount of worlds you say your project is going to have. If you want your episode to have 10 worlds, you should have at least 10 screenshots. If you're making a hub episode, you must have at least 20% of the levels you say your project will have in screenshots. This means if you have a 50-level hub episode, you need at least 10 screenshots.
Since you already have a demo up for download, I trust that you have more than 2 levels. I'll give you some time to upload more screenshots to comply with the above rule.
Also, things like updating a level's music does not warrant a new post 40 minutes from the last, or at all. Please make more thoughtful posts, and don't bump your thread with every minor update you make.