03-18-2014, 09:20 AM
here's simple cylinder from blender. You will not get medal for not using 3d objects don't be afraid of using any help especially if you don't know what is wrong in your picture. First thing that strikes me is you don't have 3th point of perspective, all vertical lines are parallel. the columns are in wrong intervals. Entrance is in wrong perspective. But mostly I don't know what you want to achieve? is it concept of the building? As an illustration you should avoid central composition and symmetrical elements cuz they make it look absolutely boring.
