If a generic critic was too look at this, he/she would say the following: "Bordering is a weak way to add composition, you really don't have much here". However...the final turnout you have here with the textured tiling as your border is simply tremendous. For whatever reason, this piece is very eye-catching, the sharp contrast the shadow produces is fabulous, and the placement of the business dude is just right...dead center.
Great job