Few ... finally got past Brother Obsore (Red ghost)
Thanks to various Lara forum hints / walkthroughs, I managed to eventually get the 1st Obsure painting. (first boss - v hard :-( ). It involved lots of croching, shooting the ghost 23 times, then quickly jumping to the statue and grabbing the painting, quickly leave the room and ghost returned to that room as I got into water. (Was last in Von Croy's appartment level - after loads of cut scenes).