I dunno, I kind of like the duller look on parts of the metal. Given that the plants are bursting out of it the way they are, it would make sense that the pipes (?) aren't all shiny and new. I really like the contrast between the plants and metal also, it's nice.
One thing about your mechanical things that might be detracting is the floaty feeling I get from them. The parts all attach to each other, but there's too much open space in between, so it doesn't seem efficiently engineered. What you have is nice, but I'd recommend adding a bit more variation in the "grate" pieces (maybe a knob or valve) and filling in some of that empty space with pipes or wires or somesuch.