Shadowman99 said:

The one shot of the imperial fleet is fine if the ships all face different directions, but the one ship sliding along the arrow needs correction pretty badly. If Adywan only did that, the shot would still be much improved.

Here's a couple more ideas I had for your consideration:

Falcon full size detail corrective matte: The Falcon full size prop was shot from a few angles that the set dressers didn't anticipate. Sometimes the detail level doesn't hold up.

Hoth Walker idea: This is really more of a general idea rather than just the one shot. Since the Hoth battle is going to be bigger and more intense, how about using a few prequel walkers?

I like the idea of the walkers being dropped by the ships, but I wouldn't have any AT-TE walkers.