When Luke is hiding from Vader under the throne dais, the consoles he’s using to conceal himself don’t even reach to the ground. When he screams “No!” he’s right out in the open like Vader couldn’t see him. there needs to be more of a maze of consoles and equipment underneath the throne.
Amongst all the chat about trooper camo and Emperor ship colour schemes, the above is actually not a bad idea. I too remember initially thinking it a bit odd that Luke just ends up being in the open in the shadow of some stairs though it was more of a niggle than an annoyance and after repeat viewings I stopped thinking about it.
.Val