Average sized 1″ (13.2 x 8.8 mm) sensor Even though Nikon 1 J5's sensor is significantly larger than a typical compact camera sensor, it is still hard to achieve that shallow depth of field and a blurry background for your portrait shots.
Very High Resolution Sensor: 21.0MP Nikon 1 J5's 21.0MP sensor will provide larger room for cropping, and you will be able print your portrait shots larger with more fine detail.
Average Ergonomics&Handling Good handling and existence of well placed physical controls on the camera body is very important during portrait shooting. It is faster and more intuitive to change the camera settings with dedicated buttons and knobs instead delving into the menus on the LCD.
No Image Stabilization Due to the lack of sensor based Image stabilization, Nikon 1 J5 users have to rely on lenses with optical IS in order to maximize the sharpness of their handheld portrait shots. Currently there are native Nikon 1 mount lenses with Image Stabilization for Nikon 1 J5.
No Built-in Viewfinder In the lack of a a viewfinder, holding the camera away from the body while using live view is not very stable, especial with heavy camera bodies and lenses. Besides, LCD screens are very hard to read under bright sunlight.