Major inspiration was the legendary poster artist Drew Struzan who has recently retired from making movie posters full time. Read his own comment here and weep hard. The worst part of this is that Struzan was one of the last to actually hand craft a poster for mainstream films and their franchies instead of just mashing together some photo-manipulated crap together. So long, you will always inspire me.
Also check out this great review of Steel of Fire Warriors 2010 A.D. on io9.com