I don't really see how what you are doing with this can work as the white on your grey scale card does not seem to be pure white (seems a fair way off to my eye). The white of the subjects top is much closer to pure white and still seems to have retained detail so is not blown. When comparing the white on the card in the image to the white on the card held to your monitor there are many potential issues. The brightness setting of the monitor will greatly influence the final output as will any colour shift due to an uncalibrated monitor. To my eye the brightness, whites and colour tones in the original are much better than in the final processed image.
I also find the way that the background has been removed to be very distracting as it has created a very harsh, unnatural outline to your subject. I would prefer to get a distraction free background in camera rather than relying on removing it in processing. If you do need to deal with a BG a touch of selective blurring would give a more natural look than replacing it with a block colour. When taking a portrait it is often worth spending as much (often more) time looking at the background than the subjects. Shooting to get a shallow depth of field will help a lot as will avoiding having bold coloured objects in the background as these will distract the eye when viewing the photo. If the background has distracting objects it can often be solved by shifting your angle, if not then move your subject!
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