Flower Composition and Play

Ok, Pinterest is showing me fun stuff in my inbox. Flowers are often a favorite subject for me and recently there have been bright colors and motion involved. Affinity Spotlight posted Melanie Khareghat's How to Create a dynamic flower photo composition back in August 2020. Guess I'm just late to this party. 

Melanie combines two photos in post production. There is no rule that says "combine only two" images. Any app that can combine images or layers would work, Image Blender, PicCollage, Snapseed, Leonardo, Pixelmator, Procreate and ... Affinity Photo or Photoshop. 

In our mobile workflow what camera app would you use? What file format would be best?