Programs used: Gimp2

I made a robotic head texture about a day ago and spent a fair few hours making it, first time making a robotic style head and i used a great youtube video from Pate50000 (will post link below) in order to learn the techniques, currently trying to sell it and have had no response so thought i would bring it here for critique would love to know what i could do better in order to bring more attention to it on the market.

Pate50000's video: https://www.youtube.com/watch?v=k21Dn75p4cU

Try adding some depth / shading