If you're going to do "sensual", I see two possible directions: either you explore the form, in which case the background and surroundings are superfluous (or at the very least, not taking away from the image), or you create a scenario in which it makes sense to see a person in a state of undress. But to be effective, we need to "buy into" the scenario and play out the storyline for ourselves. In the latter case, the model's expressions are part of the story and should be consistent with what we think we are seeing.
I associate "sensual" with some mystery, of a hint of things to come. It's appearing to reveal, without revealing. It's an image that allows the viewer's imagination to imagine scenarios and possibilites, that may be hinted at with the image. When you really get down to it, the biggest sex organ is the brain, and it's how our mental projections and fantasies that endow a person with the impression of "sensual". It's a bit like makeup - too much and it's garish, too little, and no-one's going to notice. May your next shoot get you closer to where you want to be.