Suggestions for this Composition about Slaves

[Markus Creation]

Hey guys,

what do you think about these compositions?

Topic for this piece will be: Tobacco Trade in times of the East India Company.

What I thought of is some slaves are carrying big crates full of cigars from a warehouse onto a ship in the background
while the masters in their british uniforms sit around and laugh or drink or rest or one slave is showing them the quality in the foreground.

I made these 4 sketches. What do you think, do you know how to make better compositions or any suggestions?