I don't know if it is the flash that just gave a "washed out" appearance, but maybe add a little dark gray or black wash to bring out the detail/texture of the bunker. This will also give a little weathered look to the concrete and add a little more of a sense of depth and realism. Looks good, though, keep up the good work and keep us posted!
Oh, P.S. gauze pads (unfolded) also work well for 1/35 camo netting. Soak them in a wash of the color you want the netting to be, wring out and let dry and viola, you have ready made camo net!