I think your model's skin is a little on the pink side. The grain is due to 35mm film and the 400 ASA. I wouldn't say it's unacceptable. It is what it is.
16 passes, aka multisampling, isn't going to help you with either problem. Multisampling helps pull detail out of the shadows. It makes multiple passes so that it can differentiate between actual data and random noise.
GEM is what is going to help you with the grain issue. The higher the value, the more it attempts to eliminate grain. It does have a softening effect on your image, so be careful not to use too much. Be especially careful if the image is soft to start with. Your model's eyes look a little soft to me.
The color balance issue is something you're going to have to play with. The problem with negatives is that the film base for each emulsion has a different color. The scanner doesn't know what that exact color is, so it guesses. The latest batch of film scanners from Nikon and Minolta (the V and the 5400 II) do a much better job with this problem than older models, but they're still not perfect. Your best bet here is to photograph a MacBeth color chart with the negative film of your choice and then scan it to set your calibration. Tweak your color balance values until the scan matches the color chart and then save the settings as a profile for that particular film. Make sure that you photograph the color chart under the right light (daylight or tungsten). If daylight, make sure it's not too early or too late in the day, and that it's not overcast. Also, make sure your monitor is properly calibrated.