I shot something on a white backdrop, but I can't get the color to look right

The trick is to expose your background evenly and about a half to one stop higher than your subject.
Use something like a big softbox or diffuser to light the subject. In your example the light on the subject is a small
(point)light source which causes the head to be rreasonably exposed but the hands to be in the dark.

ideally you should have enough distance between your subject and the background so that the background illumination does not
interfere with the subject.

Using a large light source close to your subject causes the light to "wrap" around it and gives you nice soft shadows and good catchlights in the subjects eyes.
 
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