its a good artwork.

but at a glance we can tell dat its not real..
the blending is not so smooth..
plus the light trail behind the cars are obviously fake..

juz my 2cents 

Remove the light flares..

First one is very nice, love the focus blur

i think its crap...
well heres my reason..
first of all... you gotta decide on whether or not you want it to be realistic or abstract
in this case where u wanna show things like silence within the city.. i guess it would be better to make it more abstract...
yea the moving blurry lights and things sort of show movement but i dont think its enough... u want to be able to speak through your drawings/renderings... where when one sees the picture he can tell immediately what is your main concept, whats ure focus.
at the moment... it doesnt really show anything... what makes ure building different from the buildings around it? whats the relation?

what you should do is try to make the drawings then go around and ask ppl what they think the picture is trying to convey
or you can even just do a blind crit with your family members for practice

im not saying that your works are bad... dont just focus on making beautiful renderings... write down ure concept in one sentence.. put it in front of your computer...then think. How can i show my building as the constant? how can i show movement? how can i show "cramped"? what do i want teh users to feel when they see my building?

i hope u dont take this in bad... just trying to help

btw
the model is good and i really like the building.. especially from the 1copy.jpg picture..and the facade looks really nice from that angle

yeah. u can see many pictures with light trails and observe the behavior.

1st, they are taken with camera. means there will be flares and mirror image around the main light trail. u can copy the layer n make it low opacity.

2nd, mostly it's not a flat image. thus, u ve to consider the perspective of the light.

3rd, u use photoshop rite? u cant use gausian blur on it because it is a filter that does very linear gradient blur. but if u observed closely, the real light trail does not behave like that. they r more intense in the middle and have a quick gradient blur around it.

nwy, i agree wit everybody. ur 3d r way too good.. 

Wuah .... cantik la design abang kepep