The Painting... From Who?

So I was on my normal day doing my normal routine when Shadow came by and showed me this painting... He told me he never did such art, only found it in his house the other day... He asked if I knew who did the artwork... It can't be me, because I don't know how to paint... We speculated to be from a very artistic fan of Shadow, but later debunked that idea due to that fact that no one knows where Shadow lives... I don't know where he lives as well... Before he left, I asked if I can scan the artwork and posted it online, to which he accepted... But as I held on to the painting, it felt cold... A familiar kind of cold...

I do not own any of the characters presented:
Sonic franchise is owned by SEGA