Wow, lookin' great so far to me. The footprints really help to solidify the figure's place within the whole area, as well as direct the composition.
My only two comments are just little things. The cape-like cloth on the figure seems to have this orangeish corona around it. It's nothing major, but it makes my eyes displace it from the rest of the picture; it's good contrast to make it "pop," but it may overstate it. Also, with that much wind force coming over that dune, the cloth at the top of the towers seems very static. I think a little billow would make it a little more dynamic.
Regardless, awesome stuff. Repost when you're finished!
"If something looks too big, make it bigger. If it looks too small, make it smaller. You're dealing with fear here, not right or wrong."