@Xialin,
Greetings, and welcome to the iClone family. I hope you're still here.
To help restart this thread for you, a couple of key points (in my opinion) are:
a) A quality diffuse map, meaning a nice high-quality and good-resolution image. You don't need a 2048x2048 pixel image for a small prop that never fills much of your screen, but larger objects that you zoom in on will benefit from a good diffuse map.
b) Bump maps make a huge difference to me. They really help give the appearance of "texture" to anything that's not perfectly flat. Even a rough canvas can benefit from a good bump map if you get close to it at all.
Also:
c) Specular maps also help add some life to objects
d) More technical, but a good UV map (how a 3D model is "unwrapped" to a 2D surface) can be extremely important, but iClone has no control over it. You need to do that part in an external modeling tool.
This should help inspire more people to chime in. Please ask more questions to help us help you.
ADDED LATER:e) Lighting. Good lighting helps everything look better, and adds to the "mood" of your film. It is one of many areas where I need to (vastly) improve my meager skills.
MORE ADDED LATER:
Here is one, fairly simplistic example of why I featured "bump maps" as a way of making good materials. It's not just the "material" but the prop itself.
In this example, the geometry is smooth and featureless. The bumpy texture is simply a result of the "bump" map which give the
appearance of highly detailed geometry.
That keeps your model very lightweight (low-poly... few numbers of polygon faces) while still looking good.
The bottle on the left has flaws. It's NOT a best-in-class example, but it does demonstrate the value of a bump map.
(The ridges on the red and yellow caps are also due to bump maps, not geometry.)

iClone 7... Character Creator... Substance Designer/Painter... Blender... Audacity...
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