Explain the title a photograph

The poem photograph is written by shirley toulson. In this poem  poet remembers the past of  mother  by looking into the picture and recognizing her enjoyable moments with betty,dolly and her uncle at beach holiday. Poets mother was 12 years old with sweet,shinning and laughing face. In this poem "and the sea ,which appears less changed" here is compared to human life as poet mother is no more after 4or 5 decades ;she is in grief ,pain and sorrow about the death of her mom.she compares human life with sea as sea is perrenial,immortal but humal life is mortal and short-lived . Since poet visits the same place where her mother had spent her holiday where she find everything as previous that was before in photo frame. Now at the end of the scene she finds she is left alone leaving all smiles,enjoment ,togetherness and affection behind. ONLY the THING LEFT WITH HER IS SADNESS,pain, GRIEF AND lONELINESS