Ork skin looks pretty badass in blue! Would love to see those models finished.
As for the terrain, cork board looks great, barbed wire is rather disproportionate unless it was erected to stub the toes of a Khorne Daemon Prince, but if the large-and-in-charge look is what you're going for, you nailed it. Otherwise, you can pick up some model razor wire like this:
http://www.forgeworld.co.uk/Warhammer-40000/Etched_Brass/40K-BARBED-WIRE.html
I'm a noob myself so I'm sure you can get it elsewhere for cheaper.
I like the paint job on the fencing! I'd sprinkle some shell casings around on the ground to give it slightly more texture, maybe some grass tufts or weeds, and maybe throw in an oil drum or some sandbags. I'd go for all of them because I prefer overcrowding to minimalism, but I think all in all the ground could use a bit more pizzaz (that's an industry term).
Keep us updated!