the stripes in the last thumbnail are a shining example of what Vig pointed out. The logo, as well as that faded bit in the center of the top set of lines stands way out when the tile repeats
I think the main problem is, that your base metal has a uniform color. You have some light stains and light scratching. But all those effects only seem to higher or lower the brightness of you metal base texture. So basicly its all one grey blue color. Maybe try to use different colors for stains, light scratches and…