if this photo is taken in 1898, then Покрышкин is 28 y/o and this is the earliest photo of him I know; later comes one photo from 1903 depicting Покрышкин (33 y/o) among his students in Владимир
if taken in Самарканд in 1898, then Покрышкин is surrounded by А. В. Щусев и Н. Н. Щербин-Крамаренко