Cool, it reminds me of tetris.
Not bad for practice. The shading done on the building is done quite well. The 3d effect is also quite well done to where you notice it, but at the same time it's not popping right out at your face. The quality and resolution of the picture is fantastic. The simplistic background serves a good purpose to keep all the focus on the building. Definitely keep up with it, I'm looking forward to what you can make with this potential.
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