Very Nice!
A minor criticism is that maybe it'd be better to have the sky and Snake's gear to not be so similar. Maybe have a warm gradient to represent a sunset or something. Also maybe rearrange the rocks or the leg a bit so the Metal Gear looks more like it's standing on them instead of floating in front.
I still think that it's kind of strange that the original box art is the only Metal Gear art where he doesn't have a headband, even if it is modeled after Terminator photos.
If this is the right half, I can't wait to see what the Left will look like.