My texture and tutorial texture don't look same!

Hello all.

I have a problem with my Substance Painter.

I'll put the images below but my preview render looks awful even though I did it exactly the same. 

I opened a high resolution project by choosing PBR - Specular Glossiness. I can't paint my model, whose UV is fine, in Substance Painter. I increased the Shader Quality (Ultra 256 spp) and changed the Environment Map, but I did not get the same result with the Tutorial.

What is the problem?