Is this from a manga?

It's Levi and a baby version of Erwin(?) on the picture above and below it's the regular Erwin(?) from Attack On Titan.

Yes, I know that. What I am asking is whether it is an illustration or part of a manga?

I asked before and someone told me it's a doujinshi. I tried to search it at myreadingmanga but only found something similar to that: https://myreadingmanga.info/araiguma-no-levi-shingeki-no-kyojin-dj-jp/.

Hey Tanuki Levi isn't bad at all heheh

sorry, following.
actually, I also have been looking for that dj ╥﹏╥