Another thing to look at is that in Iray Render settings the gamma is set to 2.2. If the actual texture on your object isn't set to 2.2 your results won't look so good. To adjust the gamma in Iray surface settings or even 3Delight click on the image in the diffuse color channel, select image editor, and in the pop up adjust the gamma. Or adjust the gamma in the render settings to match that of the gamma set on the textures of your figure.

But like the others mentioned, lighting and environment setup is also very important.

@Tirenzi3D I use that trick in the link you mentioned alot. It really does work. A lot of my promo images were done using that trick.

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