Bholi's teacher had transformed her completely — from a stammering, neglected, and frightened girl into a confident, educated, and courageous young woman. When Bholi boldly refused to marry the greedy Bishamber and spoke without any stammer, the teacher realised her efforts had borne fruit. Just as an artist feels deep satisfaction on completing a masterpiece, the teacher felt proud seeing her most challenging student become a self-reliant and dignified person. Bholi was her masterpiece — shaped with patience, encouragement, and faith.
Source: Bholi, Chapter 8 (Read and Find Out – Part 3 / closing paragraph)
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The key phrase is directly from the last paragraph of the story: "the light of a deep satisfaction that an artist feels when contemplating the completion of her masterpiece." Examiners expect you to explain the transformation of Bholi (stammering → confident) as the reason for the teacher's pride, and connect it to the artist-masterpiece metaphor. Avoid vague answers — be specific about what Bholi did (refused the marriage, spoke without stammering) to show the transformation was complete.