The best way to explain how to write a prompt is to show examples. So here we go.
best quality, 4k, 8k, ultra highres, raw photo in hdr, sharp focus, look at viewer, a photo of @model in shirt, professional headshot, grey background, perfect skin, natural eyes
a photo of @model, looking at viewer, happy, blue leather jacket, posing, outdoors, portrait photo, ultra detailed, 4K, HQ
closeup portrait painting of @model, ultra realistic, concept art, intricate details, highly detailed, photorealistic, octane render, 8 k, unreal engine. art by artgerm and greg rutkowski and charlie bowater and magali villeneuve and alphonse mucha, looking towards the camera
To specify yourself (your model) in the prompt, use @model. So it should be like 'a photo of @model.'
If you want your photo to be realistic, add keywords like 4k, ultra-realistic, high resolution, etc. Also, you can specify a camera. For example, Sony A7, Fujifilm X-30, etc.
If you're not satisfied with the results, let us know via live chat, and we will help you improve it.
Remember that we already have a lot of predefined styles, so you don't have to use your own prompts.

About Vadym Zh
Founder of SnapFusion.AI.
Twitter: @vadymzhy