Bruce Mactavish wrote (in litt.) "Yes this looks fine for a pure Glaucous Gull to me. A two year old bird with a slightly pale iris and diffuse black tip on bill with a tiny pale tip. No hint of darkness in folded primaries from what is visible in the three pictures. Bill size and shape of bird looks fine as well."
Digiscoped with Panasonic DMC-LX5 | Nikon FS 3 | 30XWA | hand-held, no adapter.