Your 50mm becomes a 75mm equivalent, which is passable for portraiture. 85mm-200mm (with a f/1.8-2.8 aperture) is generally considered best for portraiture, which on your body, would be about 60mm-135mm. (Pros also like to use 300mm-600mm lenses for portraiture, but this usually requires an assistant and radios to communicate with the model.) The smaller sensor also increases depth of field, so you may want to budget for an 85mm or 100mm f/1.8 or f/2.0 lens in the future (80-200mm f/2.8 zoom would be ideal, but is very pricey). The longer focal length will help reduce depth of field to help you blur the background in portraits.
35mm would become 52mm, which is considered a "normal" lens - decent for all-around snapshots but not...