Actually, it shows images of the face and the whole body, both frontal and dorsal, of a naked man who has been scourged and crucified in the exact same manner Jesus Christ suffered as described in the Gospels.
Yes, there are blood stains on the Shroud. Some scientists claim it is AB Negative, a rare type more commonly found in the middle east among semitic peoples. It also apparently matches the blood on the Soudarium of Oviedo, said to be the cloth that was placed over Jesus' head, which has been kept in the Cathedral of Oviedo Spain since the 6th Century. The blood stains on the Sudarium bear over 70 points of congruence with blood stains on the Shroud.
The DNA on the Shroud is too degraded and to contaminated to be of any use.
Are there any pictures of the alleged Hebrew characters?