Historically the isn't a model of the ship so we don't really know how it looked. We know of course what you said, the fact that it was a french slave ship, so we can only speculate it could be similar to other french slave ship of that era.
The shipwreck of the Queen Anne's Revenge has been found and confirmed at somewhere close to the outer banks of North Carolina. If I am not wrong, the North Carolina Maritime Museum involves in a Queen Anne's Revenge project, which disclosed and rebuilt the the ship model. You can check it on web.
