A person was found dead on the road side.
Seems mostly likely to be a case of collateral damage.
From one of his breast pockets and the two pockets of his trousers were found three paintings (more like rough sketches) and four notes.
They seemed nonsensical.
No, maybe not nonsensical. That seems to be too harsh a word.
Contradictory, yes contradictory should explain it sufficiently.
Too bad he died. If he hadn't, he could have been a living contradiction.