Note that the Mirror, a notorious fifth-column tabloid, claims to have to conceal the source of these pictures even though a military invesigation is underway.

The pictures are out of sequence, so we should designate (them) as numbers 1-4 from the top of the article.

In picture #1, at the top of the article, the victim is wearing a button-down shirt with epaulets.
In the others, he is wearing a t-shirt with a Baathist Iraqi flag.
There is no bloodstain on the hood in picture #2 and only a small one in #3. There is a large one in picture #1, indicating that it was taken after 2 and 3.
Did he change shirts during the beating?
The bag over his head is dark in picture #4, light in the others.
Could this be saturated with blood? Only if he changed back into the t-shirt after picture #1, (which, again, is actually the third in the sequence).