Koushoku Ichidai Otoko

Both anime are heavily inspired by ukiyo-e art and are set in the Edo period (though one of Mononoke's miniarcs are set in the Meiji Era). They are highly atmospheric works and deviate greatly from what is normally considered as anime.  

Both movies have elements of art in them: The Sensualist uses traditional Japanese art while 1001 Nights uses drawings. Both are psychological and highly erotic and introduce abstract things in order to uncover additional meanings. Besides, one of the influential methods in both is the harmonic synthesis of art and sound. Still, 1001 Nights is fully abstract while in The Sensualist story and abstract pieces interchange. As for me, both are striking. So if you've enjoyed one of them you might probably like the other. 

Since Winter Days (a.k.a. Fuyu no Hi) anime movie is made by many talented Japanese and foreign animators, it has a very interesting and unique mix of different types of animation. Thus, the whole movie is made up of many different short animated scenes which some of them have the similar feeling to The Sensualist art (the traditional Japanese Ukiyo-e style). Also, the story of Fuyu no Hi is an adapted haikai (haiku) collection by Basho, while The Sensualist is an adaptation of Edo period novel. Both animes have on some level similar poetical atmosphere and comic relief that you may be looking for :)