Yes, you gave an example in colloquial English of how one might (rather inaccurately) say that one's photograph is one's self but Greek is not English and the usage in Greek may differ. Unfortunately one cannot cite an example from the new testament referring to a photograph so your example is not particularly applicable to the passages wherein the Lord says "this is my body" and because of that your example is somewhat irrelevant.
And as they were eating, Jesus took bread, and blessed, and brake it; and he gave to the disciples, and said, Take, eat; this is my body. And he took a cup, and gave thanks, and gave to them, saying, Drink ye all of it; for this is my blood of the covenant, which is poured out for many unto remission of sins. But I say unto you, I shall not drink henceforth of this fruit of the vine, until that day when I drink it new with you in my Father's kingdom. (Matthew 26:26-29 ASV-1901)
And as they were eating, he took bread, and when he had blessed, he brake it, and gave to them, and said, Take ye: this is my body. And he took a cup, and when he had given thanks, he gave to them: and they all drank of it. And he said unto them, This is my blood of the covenant, which is poured out for many. Verily I say unto you, I shall no more drink of the fruit of the vine, until that day when I drink it new in the kingdom of God. (Mark 14:22-25 ASV-1901)
And he took bread, and when he had given thanks, he brake it, and gave to them, saying, This is my body which is given for you: this do in remembrance of me. And the cup in like manner after supper, saying, This cup is the new covenant in my blood, [even] that which is poured out for you. But behold, the hand of him that betrayeth me is with me on the table. For the Son of man indeed goeth, as it hath been determined: but woe unto that man through whom he is betrayed! (Luke 22:19-22 ASV-1901)
The cup of blessing which we bless, is it not a communion of the blood of Christ? The bread which we break, is it not a communion of the body of Christ?
(1 Corinthians 10:16 ASV-1901)
For I received of the Lord that which also I delivered unto you, that the Lord Jesus in the night in which he was betrayed took bread; and when he had given thanks, he brake it, and said, This is my body, which is for you: this do in remembrance of me. In like manner also the cup, after supper, saying, This cup is the new covenant in my blood: this do, as often as ye drink [it], in remembrance of me. For as often as ye eat this bread, and drink the cup, ye proclaim the Lord's death till he come. Wherefore whosoever shall eat the bread or drink the cup of the Lord in an unworthy manner, shall be guilty of the body and the blood of the Lord. (1 Corinthians 11:23-27 ASV-1901)