can you post some reference images you used?
i doesnt look like a building to me at first glance. the windows dont really look like windows, theres no entrance, and i dont know what that blue thing in the front is.
i would expect a lot more cables, neon lights, graffities and in general dirt and clutter in a cyberpunk setting.
if you want to become better at pixel art id recommend doing a few tutorials from lospec.com or other ressources.
your work here for example is technically no pixelart. pixelart is about having control of every pixel. this means you want to use a limited color palette, and your work has 234 different colors.
a good start is this tutorial:
http://pixeljoint.com/forum/forum_posts.asp?TID=11299keep improving!