The good: the model is well done, the scene is nicely composed, and I give you points for even attempting figures. They really add human interest to the scene.
The bad: you didn't really get the camo schemes for the uniforms that close; generally there is no "gray" camo clothing. The commander on top of the train car looks closest to acceptable, but of course this is coming from a figure painter with a dedication to accurate German camo. They ARE quite challending to paint,.
Suggestions for improvement: lose the "Truffula tree tufts" on the groundwork and get some actual railroad scale gravel and put it down with maybe some static grass patches. You'll have a much more convincing and pleasing ground cover. Alternately, you can put a black oil wash over your gray ground paint and then try drybushing the stones or wiping off the wash off the top of the stones when it's dry. It will give you a better loooking ground.