What was the subject matter of paul cezannes paintings?

Question

I am not sure how in-depth an answer you are looking for Ureil,
so I'll give you a choice of three correct answers:

ANSWER 1 (good)
He painted still lifes, portraits, landscapes, religious images, and studies of bathers.

ANSWER 2 (better)
No matter what the subject matter he was actually concentrating on painting compositions of color, tone, line, and shape.

ANSWER 3 (best)
He painted the simplification of naturally occurring forms to their geometric essential showing different simultaneous visual perceptions.

Answer 1

Whether painting still lives or landscapes his real subject was innovation and advancing painting toward modern art more so than any painter of his age. He is considered the father of modern art for that reason. His subject was art and what he could do to move it forward into the next century.

Answer 2

I won't be academicist; just reading a book. I hope this translation from french fullfils you
The key word of Cézanne is realization: realization of his own formal conceptions on direct contemplation of nature, without representation