Is that a triforce I spy on his paper? Ahaha, very nice. This is definitely one of my favorite PL fanarts. Gorgeous work, the lighting and sepia-tone remind me of an old movie or something... All of your Layton art is just magnificent, I hope you don't stop any time soon.
I LOVE the Prof! And your take on him is fabulous! The math puzzles were always hard for me, too. About the picture: you have some really interesting soft line-work there. I might have to experiment with that myself a little.