彼(かの)女(じょ) kanojoは wa僕(ぼく) bokuの no見(み)せ()た() miseta写(しゃ)真(しん) shashinを o楽(たの)し()ん()で()い()た() tanoshindeita。 She was enjoying the photos I showed her. Literal She [topic-は] my showed photos [object-を] was-enjoying. 僕の見せた写真 is a relative clause where 見せた modifies 写真 — 'the photos that I showed.' The indirect object (彼女に) is naturally omitted because it's clear from context. daily liferelationships~ていた (past progressive/state)relative clause modifying a nounmasculine first-person pronoun (僕)
彼(かの)女(じょ) kanojoは wa僕(ぼく) bokuの no見(み)せ()た() miseta写(しゃ)真(しん) shashinを o楽(たの)し()ん()で()い()た() tanoshindeita。 She was enjoying the photos I showed her. Literal She [topic-は] my showed photos [object-を] was-enjoying. 僕の見せた写真 is a relative clause where 見せた modifies 写真 — 'the photos that I showed.' The indirect object (彼女に) is naturally omitted because it's clear from context. daily liferelationships~ていた (past progressive/state)relative clause modifying a nounmasculine first-person pronoun (僕)