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The heads being cut off is an artefact of the way in which the AI generates these images. Since it is trained on 512x512 sample images, when generating an image that is greater in dimensions, it will often cut off body parts.

This can be fixed by generating 512x512 images, then doing what is called out-painting, to expand the canvas and its content.

Ok for the outpainting I'll have to try.
Other users have also suggested this: third person view, seen over the shoulder. maybe also a description of the hair would allow to have the whole head. i have several tracks to explore now.
Thank You

Interesting. I would never think about using third person view in the prompting but an interesting way to get around the issue! Thanks for sharing.