I think if there was any minor issue I would have, it would be the perspective of the buildings behind the Slave 1 (both when Han is being loaded, and when Slave 1 is escaping).

It seems that the perspective is off, in that the buildings should appear as either level to our eyes along the same level as the Slave 1 platform, or they should be slightly angled downwards, as they would be slightly above us.

Here are the 3 areas in red:

Here are the perspective lines (hash tag is the image; solid line is roughly what the perspective should be):

Granted, the solid lines (especially on the right) are a little too angled, but the buildings on the right should be at least level with our eyes, if not with a slight tilt downwards (or as if we are seeing them from slightly below the roof line).

You have a similar situation in the scene where Leia is firing at the Slave 1: the building tops are angled not so we are slightly looking from below them (as they would still be higher than us, even at a distance), but as if they are tilted towards us, allowing us to see them as if from a bird's eye POV.

I know it's pretty crude, but something like this:

Also, would it be an interesting idea if the Slave 1 had similar running lights as the Falcon (ie little things to give the model a bit more life)? I know lights on the gantry where Han is being loaded may wind up being too much, but just an idea nonetheless.