Conversation so far:
What works did Lawrence Alma-Tadema paint during the later years?
he also exhibited two works that earned him the Grand Prix Diploma.
Where did he exhibit the works?
Not only did he assist with the organisation of the British section at the 1900 Exposition Universelle in Paris.
Did he win any awards for his work?
receiving a plentiful amount of accolades along the way, including the medal of Honour at the Paris Exposition Universelle of 1889.
What other awards did he win?
the Great Gold Medal at the International Exposition in Brussels of 1897.
Did anyone of note comment about his work?
CANNOTANSWER.

Question: What is the most fascinating part of the later years of Alma-Tadema?
Self-contained rewrite: What is the most fascinating part of the later years of Alma-Tadema?