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.

Here is the deal. IF somebody wants me to make figures, they have to be SPECIFIC. If you dance around the subject and hint you want hookers,or anything [ ... ]