Hi, i'm a beginner on blender and that's the first good model i made. Could you explain me how to pack textures into the file ?

Sorry for the late response. Under the "File" drop-down menu, there is a sub-category called "External Files". In there, there is an option called "Pack into .blend File". It puts all of the external data (like textures, reference images, etc.) into the file, so that they'll be there when the file is transferred to another computer that may not have the images there.