Some feedback;
First and most importantly: a great first attempt on streamlining the necessary forum addition process.
Second: a somewhat annoying typo in the 'Availability of the cover' section; CD instead of CP.
Third: In case a user chooses to add a commercially released cover: please place the suggested YouTube link at the bottom of at the input / message field instead of the top. That way the focus is on the remaining information which the user is supposed to supply and the video is not in the way of the work link just below the video.
Last: My main concern with the form as it is now is that you're trying to accomplish two things at once. You want to use one form to fit all submissions (commercial and webcovers). This makes the form imho more complex than necessary.
At the moment this may not be obvious as the current form only contains some basic questions, However, as soon as the rest of the form is implemented users will have to go through more steps than necessary, This will lead to users abandoning the submission process, resulting in half filled out and / or abandoned forms.... Not something we want, I guess.
I would suggest to split the admission processes in two: one submission process / form for commercial covers and one for web covers. How?! Let users choose themselves which kind of cover (commercial / webcover) they want to post. This requires 3 buttons (including the error button) at the the bottom of work / performance pages to choose from with - and this is important - tiny INFO buttons next to each of these buttons (which will open up little explanatory text fields helping users to select the correct cover option).
I hope I make sense
Looking forward to some more feedback from both users and editors and managers !