An easy way to enhance the look of any diesel locomotive is to blacken the grills and vents to provide more depth.  You can use a black wash to bring out the grill or vent details.  Weathering powders are extremely effective bringing out locomotive vent and grill details.

 This is Micro trains Line SD40-2 Santa Fe model which I customized with working ditch lights.

This is the first mainline run without any of the extras.

Micro-Trains Line Dormitory Camp Cars #2 Build

I enjoy building laser kits, but have never attempted to document a build.  This is my first [ ... ]