I think Ronster's idea is really good - and I don't want it to get lost in the sea of posts.

The shot of the artillery hitting the AT-AT leg is really... awkward. And could stand to be replaced. Why not do something more visually exciting... like an exploding AT-ST? That'd be really cool to see on-screen. And maybe you could have an AT-AT in the background, walking forward.

Also, the brightened AT-AT shot is a really good idea, too.
Even if you don't add an interior. Which should be done anyways. It'd match the fact that we can see the interior through the binoculars.