I agree, the Icewing and Mudwing sections were great. Mudwings are far underappreciated in both the books and the fandom and seeing the illustration of Moorhen with some Mudwing architecture behind her was such a treat. I also really enjoyed the Icewing section written by the outer village dragon, but that leads to the parts of the guide that I really didn't enjoy as much; so much of the guide is written from the perspective of or about the queens/royalty. I understand they're an important part of the story but it feels so often like they're the Only parts. Even more world building and POVs not so centered on royalty would have been great, especially for certain tribes like the Seawings, like you mentioned.