>>39786524Not sure I found It through a random google search.
The picture appears to be called Lugia et Ho oh (so maybe artist is french)
I have 2 obscure leads for you:
1)website that is selling prints of the picture is based out of Granite City, Illinois.
2)and maybe these people know
https://mobile.twitter.com/teamrocket/status/369269353797009408Pic related seems to be a similar style so maybe same artist?