Don’t be afraid to get down and dirty…
While your subject might be in a fixed position, it doesn’t mean that you as the photographer has to be. It’s ok to move around the subject, closer, farther away, up and down. Remember, we live in a 3-dimensional world, with all the freedom of movement that it allows us. Don’t be afraid to move around, go in as close or as far as the focal range of your lens will allow.
If your subject is a child or an adult sitting or laying down, don’t be afraid to get down to their level to take the shot, you might be happily surprised with the results if you do.
In conclusion
As with all types of photography, practice makes perfect, and even the best portrait photographers in the world have made mistakes so don’t beat yourself up if it happens to you too.
Remember to treat each portrait shoot as a learning experience, don’t be afraid to try out new things, and have lots of fun in the process!