F/A-37 Talon

Kind of a render with some PS work.... i don't know why but the materials that i try to use in kerky don't render as good as i want it to be, for example the aluminium that i try to use for my aircrafts... maybe thats because i dont use the proper settings, but i didnt find any info about what a certain setting do, so that i would know what to change for a better effect... eitherway the best result i obtain with the marker color from sketchup....