ampler: DPM++ SDE Karras (Recommended for best quality, you may try other samplers)

CFG Scale : 5 to 9

LORA weight for txt2img: reccomended 0.3-0.7 (0.4 best results in my experiments)

Keys: SWSD, FLWR, NOFLWR, back view, inside church

Keywords:

SWSD is the main keywords, necessary, always use it, might be necessary to use a weight 1.3-1.5. It stands for Sexy Wedding Short Dress

FLWR is an optional keyword, might need to use a weight on it 1.2-1.7. It stands for Flower and by using it you will end with a dress with many flower decorations.

NOFLWR it's the opposite of FLWR but doesn't always work, might need a bigger weight

back view, inside church these are self explanatory.

Also, you might want a not white dress, in this case you can add stuff like "red dress" or "black dress".

Enjoy!