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.

Micro-Trains Grain Tower Build by Modelersguild.com

Oh I can feel it, the empire is growing. Granted it is Z scale yet that diminishes nothing in the [ ... ]

Here's a pic of the six, so far...

I've finally added as much plaster cloth as I expect I'll need, and have moved on to priming the base before painting it.  Priming made it look unfamiliar, [ ... ]