This is a Buddhist image from the Gandhāra region, an area that expands across present-day eastern Afghanistan and northern Pakistan. Statues from this region are characterized by facial features evoking the sculpture of ancient Greece and ancient Rome. This is thought to be an image of the bodhisattva Miroku (Skt. Maitreya) on the basis of its hairstyle, one that would have been worn by an Indian Brahmin.
 
IWAI TomojiEnglish by Mary Lewine 
Buddhist Art Paradise: Jewels of the Nara National Museum. Nara National Museum, 2021.7, p.352, no.2. 

"A Buddhist sculpture from Gandhara, the birthplace of Buddhist imagery located in the region of present-day Pakistan. The deeply carved facial features and the wavy hair reflect influences from ancient Greek and Roman sculpture. Based on the hairstyle and adornments, the figure is believed to represent Maitreya Bodhisattva (Jp. Miroku Bosatsu)." 
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