This is one of the most elegant pegasus designs you can fold with a sheet of paper. John Montroll's pegasus design provides a really nice blend of complexity including a 'double unwrap fold', two sink folds (open and closed sinks), and a few brilliantly pleasing unlocking sequences. There is a really nice balance of petal folds and reverse folds scattered throughout this model. It's not for the faint of heart, however, and it can easily take 2 hours to fold. I think you will find the symmetry, shape and details to be stunning, all the way from the wings to the eyes, to the mane and the tail. This is a model you really don't want to miss.
Origami for the Enthusiast Second Edition
A single piece of origami paper (kami) is recommended. A 25 x 25cm or 26 x 26cm sheet will be fine. For the really experienced folders that enjoy a special challenge, this model is very achievable with 15 x 15cm paper or smaller. If it's your first time, however, I'd still suggest using a larger sized paper to really enjoy the aesthetics of the design.