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You could inspect her for the firmness of her ass or tits, the tightness of her various holes, the flatness of her stomach, the muscle tone of her arms and legs. In part it depends on whether you want to make humiliation an element of your play. If you just want to be a strict master, inspect and grade those parts of her body she can easily control (for things like being properly shaven), or for things she would have to work out to achieve (flat abs, nice ass, etc). If you want to humiliate her (assuming she enjoys that sort of play) be more intrusive--check her anus and pussy for tightness, cleanliness or wetness. You might evaluate her as if you were buying a horse--does she have good teeth and so on.
You might also set standards for wearing or not wearing perfume or deodorant and other grooming issues. Decide what you like and require her to maintain that standard. This obviously touches on outside the bedroom issues, and since she isn't a 24/7 slave, you need to discuss with her whether she's willing to accept those rules from you to facilitate your bedroom play.
You could also give her some slave postures (google something like 'bdsm slave positions' and you'll find pages devoted to that) and evaluate how well she has learned them. You could be demanding, like a ballet teacher ('No, keep your back straight! Your knees are too close together! You need to practice more!"). But remember to praise her when she gets it right. Remember that harshness when a slave fails needs to be balanced with praise when a slave succeeds. That's how you build the deeper emotional bond between master and slave.
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