This is fanart from the anime/manga Naruto. Don't worry if you don't know the series, as he's essentially a ninja. If you don't know about Naruto, you can pretty much skip the rest of these comments.
I drew this during the 3rd part of the chuunin exam and it is what I thought that the Anbu looked like under their cloak before it was revealed what they really looked like a little later on in the story. Pretty close, I would say, considering I had no idea what it was. But there are obvious differences.
File size of the original picture:
(450 x 800 px)