Aiding a criminal? Harboring a fugitive.
Narc, snitch or rat.
If your brother is a criminal you should call the police and ask them what to do from there.
true
desperado
vilen
A Picture Framer
police
A picture on a wall could be a mural, a painting, a photograph. It depends on the picture.
It's "Criminal" vs. "Civil" justice, that's why. Not criminal/victim :-)
You would call them a Forensic Scientist.
A posed picture can be referred to as non-candid, or a portrait.