I think that segment is just fine. The (x-wing) explosion is far enough in the distance that any debris would be too small to matter.

Would it be conceivable to show the hanger and maybe the ion cannon in the distance behind the rebel transport? In fact, shouldn't we be able to see the line (where the AT-AT battle takes place) off to the left?

I know this is crude (via Paint) but something like this:

Adywan said:
1. These ships are pretty high up in this shot and the scale of everything wouldn't allow you to see anything on the ground. You definitely wouldn't see the hangar entrance or any ships on the ground.

I would have to disagree a little here. You may not see actual troops moving around and all, but you should still be able to see the hanger opening, the trench line and the ion cannon and shield generator, all due to the fact that we can see the mountain plateau (that I assume is where the rebel transport and 2 x-wings are coming from) and the surrounding ground. The shot couldn't be more than 3000 to 6000 feet up into the air and taking into account:

(1) no clouds
(2) reflectivity of sunlight on white snow

Large items like the ion cannon and shield generator would definitely be noticeable from this distance considering there is nothing to inhibit our view (be it humidity, smog, clouds, etc). Spread out items like the trench line (the gun turrets would be mere dots) would stretch out far enough that the pattern could be seen from high up - ala a farmer's field.

Now the ion cannon and shield generator would probably be smaller than the rough sketch above, but they should still be visible to some degree.