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.

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

Well here goes nothing. I bought a MTL F-7  trainset, a GP-35 trainset, also a Marklin 81466  Micado steam loco set.I also got 2 packs flex track [ ... ]

Here's video of my layout, first in near-total darkness, then in daylight. [video:http://www.youtube.com/watch?v=cLmc2DIJHkY 100x100]