Much of his art he posts only to Twitter and not on his pixiv. Since he purges his Twitter every 2 months or so of all its art and half his tweets, much of his art is completely lost since it hasn't been uploaded to other image sites and he doesn't post it to his pixiv. This image of Ferry, for example, is one of the lucky ones that managed to survive because someone uploaded it to gelbooru/rule34. https://gelbooru.com/index.php?page=post&s=view&id=4641803.
Practically nothing survived from his twitter when he was known as amanekuu.
If you want to save the work of this artist then make sure you follow his Twitter because there's no guarantee he'll upload it to other sites and he deletes it all randomly.