Help! - Blurry Texture Resolution

Hello! Sorry for this naive discussion but it's my first time using Unity to create skins. So I wanted to know how I apply, for example, a camouflage on the standard player model soldier of a game without the texture not being this way: https://imgur.com/a/a0GSMZ1 (I say, the camouflage having a definite resolution and not that strange coloring of it) Thank you very much for your time and sorry again for my ignorance!