Well done and thanks for sharing,
what I would say is you need to take a bit of time to photograph your model so that everyone can appreciate it.
inthe case of a small model, isolate it and remove any clutter, distractions from behind, by all means stick a common object like a paint pot in one shot to demonstrate how small you can work at .
next up the photo's must be in Focus , when taking a shot, same as a gun, hold your breath and sqeeze the trigger(don't pull) smoothness when depressing the shutter / button
Your painting looks good, but the grains of sand on the walker break the illusion of the scale of the model ( like water in old films , massive droplets on tiny models)
also like the figure model rule that no matter how heavy your backpack you will still stand on the surface even in mud your feet won't be that deep, you need to think about why the sand would be up on the shoulders of the At-At try and think of the story behind the ageing. If it's a sand storm sand would be trapped in out of the way placed that subsequent wind wouldn't clean away ..... At this scale probably just dry brushing might be enough.
Well done and keep it up , I have not seen these toys updated before and it looks good.
I am not being critical just trying to give you some feedback . There was a lot of views with no comment .
I wouldn't attempt something so small so kudos to you