Hi Roxana,
Have a look at your Textures by themselves (SHIFT+CTRL+LMB on the Nodes), especially the Roughness (and maybe the Metallic) The Roughness should be fairly dark and the Metallic white, where it’s metall and black where it’s not. Maybe your Roughness Texture needs to be inverted (Add a Color > Invert Node between the Roughness Texture and the Principled Shader…)
