Conversation so far:
What was maturity?
The years between 1434 and 1436 are generally considered his high point.
what was one of his successes?
the Madonna of Chancellor Rolin.
what was special about it?
van Eyck was considered revolutionary within his lifetime.

Question: what was another success?
Self-contained rewrite: what was another success of Jan van Eyck other than the Madonna of Chancellor Rolin?