I loved the opening and closing credits! I don’t have many unique things to say,most of my sentiments echo what others have already said, but I had an idea for the ending credits.

EddieDean said:
Here’s a question for you all: If I run out of concept ART for the closing credits, would it be best to fill the gaps with promotional shots from the episode (so nice shots but not concept), or other concept materials like the images they show when creating new assets like sets or characters, which are less beautiful but interesting in a different way?

I think if you want to keep the beauty aspect, you could potentially use screencaps from cut sequences/episodes. Stays thematically relevant and gives kudos to the rest of the series. Maybe you could throw on some sort of filter to make them look more like concept art?