Thanks for the advice
I've made all the edges sharper, made the 'background' ( everything besides the tubes and the main plate ) a tad darker and I've fixed some tile problems in the corners.
Dandy! And finally I've resized it to 128X128 because
a) 256 is a bit big for a ventplate
b) it washes away my ****ups
I don't know which size looks better so I posted both