These are some movement/pose thumbnails I did in preparation for my final image.
With number 1, I had the thought that Phoenix could be showing a demonstration of her powers by shooting fire from her sword.
Number 2 and 3 were more just poses and stances for her with the sword. (Which can also light on fire). The idea was that I would also find different perspectives for these poses if I were to choose them.
Number 4 felt like a more majestic take on her. I wanted the shot to convey a powerful stance, and the fiery wings on her back were to show the phoenix inside her. It also works as part of the demonstration of her power. That being manipulation of fire.