get flat colour out of you head. just because something is stylised or cartoony doesn't mean that you put no effort into the texturing. i want you to be proud of your work. your artwork should tell a story. Flat colour don't say anything. what is the beam. is it rusted, was it once painted and the paint is chipping off or has someone come along and tagged the beams with graffiti. paint studs into the beam.

think warner brothers cartoon background

don't be insulted just give the objects character.