Thanks Nigel and Pilou for the nice comments.

Thanks Mal
"Just a thought(not a criticism)"
no problem. I will change that when i`ve time and post an update. I will use some offset in the textures.

Thank you Danny
I`ve used cinema 4d for texturing and maxwell for rendering. Texturing and lightning is for me always the tricky part.
It`s trial and error until it looks right. The textures i have downloaded mostly from cgtextures and made them tileable. An edited grayscaleimage is used as bump- , displacement- and roughnessmap.

Greetings
vinced