if possible, more pictures, lower the learning rate, and you'll get MUCH better quality by cropping the images tighter. Try to focus as much as possible on the person and the balloon with as little other stuff around them. don't be afraid to crop out hands and feet when feasible. tighter cropping alone with improve your next run 10x

I am trying the model in a1111, do I need to prompt 'woman sitting on a balloon' when trying the model?

Apologies for my too many comment. So I have to use an SDXL model to use an SDXL LORA....I was not doing that! It works - nice work!