I think your presentation lacks an image in which the roughness is visible. The 3 images in which you show your material on a plane are fine, but maybe play with the lighting a little to make that roughness variation visible. Looking at the roughness map in your last image, I think the values are too close to each other. I might be wrong, and the roughness might look good, but I wouldn't know unless I see an image that shows the roughness well.
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Thanks, I am glad you like it!
@radumitroi
Thanks for the feedback. I am currently working on my next material and I will definitely use this feedback going forward.
Recently I posted the cobblestone on ArtStation. https://www.artstation.com/artwork/nPqL6