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This question already has an answer here:

enter image description here

That doesn't look right at all.

Also,

enter image description here

Why is his face all black?

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marked as duplicate by cegaton, Shady Puck, David Aug 13 '16 at 3:22

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    $\begingroup$ A few questions before we can help you: what reader engine are you using? Did you UV unwrap the mesh? What shading mode is the 3D view set to? $\endgroup$ – David Aug 12 '16 at 23:25
  • $\begingroup$ 1. cycles render, 2. yes, 3. texture $\endgroup$ – Peek Utch You Aug 12 '16 at 23:26
  • $\begingroup$ is it because the background of my texture is nothing(trasparent)? $\endgroup$ – Peek Utch You Aug 12 '16 at 23:30
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To use any image with transparency (alpha channel) in cycles you need three nodes. Typically a Transparent BSDF, a Diffuse BSDF (or some other color shader) and a Mix Shader.

Here is the most basic node setup for a transparent image texture in cycles.
cycles material nodes for an image texture with alpha

However that is not what you want, if you use that setup you will end up with you guy's head being see through.

Now the principal is simple, you treat the color data and alpha data differently.
The color data gets displayed, but the alpha gets used as a mask. What it is masking is totaly up to you and your specific nodes.
In my nodes, in the image above, I'm making the alpha completely transparent, with the Transparent BSDF.
However for you, you can use your base color instead of a transparent node.

Here is an example showing the difference between using a diffuse node (left side) and a transparent node (right side) as the base under the image texture.
transparent image on diffuse, and transparent image on transparent shader

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