The overall pixel image looks great. The bottom right wall/pool side is a
little messed up in color though so the shading and color palette may
need to be addressed. Also, some of the blocks look as if there is
spacing between them. I would just make sure that you look at blocks
that may not be placed on the same plane or connected. Make sure it is
executed correctly.
http://mbfishman-gdd110.blogspot.com
In order to improve my design, I could make things more symmetric and complimentary in size. I could try and make the image less blurry and make sure the diagonals are right. Otherwise, I just need to make sure it is completely isometric and in the right perspective.