While this depicts a habit, it does so in a rather dull, literal way. You have to work a bit harder to make a still-life of economics and calculus text books visually appealing.
2 minor things. There's no assignment on the paper, so the pic simply implies work to be done. The paper is upside down (top margin at the bottom) instead of oriented the same direction as the books. Fair photographically, but I think it could be done better.
Great Idea for a habit, most original "real" habit I have seen in this challenge. Every one of us has that one. I think this one would have worked better in color (something would have to be done with the wall in that case, maybe a dark sheet). All the different colors on the books and table would have played well together. The virgo in me tells me that I might have had the binder paper that looks like I was intending to write something down. Nice picture.
I know this one. :) Nice photo, maybe if you had tried to get closer to the subject (no pun intended) the negative space would not be so distracting. I am a believer that it is okay to cut off some of what your trying to capture if properly positioned.
Would convey the idea better if not so neat. The line between the wall and the table is centaered (poor composition), and there is too much blank area, both dark and light. I wonder if a vertical would have been better.