Asami Inoue and Akane Yoshida are the two concept artists credited in Super Mario Odyssey, but they don't distinguish which artist did which, so for now I tagged both
I directly contacted him through Facebook and showed this version, and he approved. A story link is not a good idea since it vanishes after 24 hours.
I assumed you managed to grab the artwork from his Instagram story without the Portuguese text overlaying it. Also, if you did source it from his Instagram story, the story link would be valid. We have bad id/bad instagram id for accurate sources, but their links are dead.
Anyways, I guess you didn't link his Facebook as the source because his Instagram handle is in the post or you found it on Instagram originally? Also, you could've left it as a non-web source too and left a comment saying you got a full-size PNG from the artist himself by contacting him on Facebook. That'd work too.
Oh and for anyone interested, the artist uploaded an unwatermarked, but lower resolution version on Facebook if anyone's interested in it. (Archived: asset #22583709)