If you find it hard to make the chin looks better in the portraits, you should ask the subject to raise his or her chin a little. Apart from asking the subject to pull the neck out slightly, as a wise photographer, you should ask your subject to lift the chin slightly. However, you should try this method a couple of times before you put it into practice in professional level photography. Depending on the type of the subject’s face, you may have to change the elevation.
If your subject lowers his or her chin towards the chest area, it will compress the region below the chin. That makes your subject to look slightly grumpy. You must always use your common sense and eye to keep your subject’s chin at the perfect level. Overdoing this elevation will make the portrait look really weird. Just let the subject move the chin up a little and ask him or her to look slightly to a side.
In addition to that, when it comes to lighting, the best option is to use off-camera lighting as the main source of light.