( Not my Model )

https://civitai.com/models/999564/aisil-style

This LoRA style is characterized by its radiant, flowing textures, meticulous detailing, and a harmonious balance of natural and otherworldly influences, can help creating fantasy portraits.

For full effect:
Put trigger phrase before prompt.
Describe the background as "abstract vibrant" or "volumetric vibrant" or something similar, without being specific, or simply do not describe background.
Use higher LoRA weight (1.5-2.0).