I always assumed that Leia flew close enough to the Executor as to be out of the angle of the tractor beam. Its the Empire, they assume that everyone will be running away from them. It's shown multiple times that they have no idea what to do when things come closer or start attacking them.

Also, I'd originally thought that the forced perspective were forced perspective, then figured that because they were so bad, maybe they were just decorations. Then I see that painting and now know that they are supposed to be forced perspective, and it makes me sad that they weren't done better.

Ah, for what might have been...