Works are no longer hosted here at the request of the artist.
Artist. Formerly, mistakenly tagged as shinryoku (j-1).
It's curious that his pixiv profile has a link to a Japanese tattoo shop webpage, and he once said that he has a tattoo of ganesha on his right arm.
Shin'en frequently posts artist self-insert images, usually beside his waifu. In images, he's tagged as Shin'en-san.
There are several Pixiv tags for these images:
Japanese name: 深緑 or 深淵 (Shin'en) (Reading is given by the artist.)
Circle name: 玉露カンパニー (Gyokuro Company)
Defunct twitter username: sinen73