Arch Design 3 - Beta

My progress on designing an exhibition facility for a piece of modern art, is beginning to produce presentable results. On the following rendering the form of the construction acting as roof (for the frontal part of the building) is depicted.

The shadows created on this rendering are considered the worse possible, given the position (angle) of the sun. Thus the percentage of coverage is efficient (?). I think i am going to need some help from my tutor on this.