Somebody loked my last topic…
http://forum.unity3d.com/threads/119226-Question-How-to-make-the-game-more-realistic-with-a-good-graphic-and-render
so please lets resume the conversation in this topic.
In before this gets locked too.
But on a more helpful note, what does your game currently look like? Post screenshots so people can evaluate your work and give feedback.
Please stop posting this topic. Generally speaking, if a moderator locks the topic (it wasn’t me though), it’s for a reason, and it’s not an invitation to start the same topic again. You already got the correct answer, which is “use better art and techniques”. Try coming up with a specific question that you’re having difficulty with. Because asking “how do you make good graphics” is far too broad and not answerable in a useful way.
–Eric
So before you locking topics, tell the reason!
He just did. 
Seriously Just post your current screenshot…
He didn’t but… okay -_-…
EDIT:
I will post a screenshot here.
Somebody who put more effort in to their question - even though it’s still broad - got relevant information more quickly:
http://forum.unity3d.com/threads/119327-Looking-for-tips-3d-art-training
It’s simple, you get a proper artist.
I dont think that locking his threads is necisary 
just wait untill he posts a screen shot then we can give him some information, some pointers on what makes his models bad.
And…he still haven’t post any screenshot…
He is proboly sleeping, why dose it matter if he dosent post them this post will just fall of the face of the earth and no harm done?
If that happens, then he would have WON… don’t you get it?? X)
Friends relax!
When you’re awake I’m asleep …
I will post the screen shot on a minute.
Uploaded with ImageShack.us
The soldier looks nice…
But the buildings not really good…
there is a lot of pixels.
there is bad lighting…
the textures are really BAD.
Probably because it was done by professional artist
None of these problems are with Unity. The assets themselves, as you’ve pointed out, are not that great.
-_-…
So… How can i make them looks better?
Become a better artist!
Do online tutorials that cover your area of interest – texturing, hard surface, organic, etc. That or enroll in an appropriate school.
Practice practice practice.
The building models are from big company!!! O_O…
so you king of wrong…
Maybe you have another idea?.
Well, Windows ME was from a big company. Didn’t make it good. Those models aren’t that good either.
I told you and i’m telling you again:
The building are good…
Maybe the textures are not and maybe the lighting are is not well…???