So Lalaithiel is looking to make some Mockingjay movie style wings and asked for help sizing them properly. Now, Mockingjays are a fictional bird species, but have similar properties to actual birds, so its tricky but doable. This journal should document my process from concept to design, hopefully it'll help anyone else out there with questions about Part 1.
References - Mockingjay's are a hybrid between the fictional Jabberjays & actual Mockingbirds, so starting there:
+ = ?
Not bad, on the book cover art the wings are a little longer/thinner than an actual mockingbird, so they have a few more feathers to them, but they seem to share the same most of the same feather shapes as found here: