Cedric,
Shapes and colors in general are very interesting subjects from my point of view.
In your series, I prefer the composition of the second photo.
For the first, I personally would have considered two ways of approaching the subject.
I believe, that you aimed for the two different types of pillars (round/square) and the yellow/orange contrasting with the gray concrete.
Rachel's comment about shooting from a greater distance is a good idea, for this I would have searched an angle which helps to recognize the pattern of pillars easier.
In order to enhance the shapes, I wound have gotten closer to the pillars, trying to capture both the shape created either on the floor or on the ceiling and including the pattern using a wide angle lens.
Still - this is my personal view and there could be things in your composition that escaped me.
Best regards,
Michael