The legs are pink. The bright yellow primaries and outer tail feathers eliminates female crossbills. There are several species of Greenfinches, Goldfinches, Canaries, Serins and Siskins that we need to consider. The birds bulk argues against the smaller species such as Eurasian Serin . The mystery bird's coverts are uniformly gray-brown.
Separation is relatively simple however.
This leaves Eurasian and Oriental Greenfinch . Oriental Greenfinch is common on the eastern edge of the Palearctic region including the Kamchatka Peninsula, Japan, Korea, Ussuriland, and eastern China with vagrants reaching Taiwan and the western Aleutians. Eurasian Greenfinch is found throughout the western Palearctic and has been introduced to various regions including New Zealand, southern Australia, Uruguay and northeastern Argentina. The gray head is clearly visible in these Oriental Greenfinches , enjoying some seed at a feeding station in the Japanese Alps. In our bird, the gray-green color of the nape flows smoothly onto the mantle.