The technical reason her nose is getting too big is caused by the wide angle effect. Professional portrait photographers (as I am not, absolutely not! :) have a rule to use about 90 mm lenses to get the best portraits with only least distortion. Dependent on the camera you use (those focal lengths confuse me on modern digicams, all based on different values), it's about a 2 times magnification compared to normal (whatever that 'normal' might be). And Emma certainly deserves to get on the picture undistorted! :)