You need far more images than just one to make an effective LoRA. Generally 20+, preferably 30+. I can recommend my guide for more information
https://civitai.red/articles/8370/nanashianons-cool-lora-training-guide-for-attractive-people
I also have various guides on different parts of model making, and an example model with the training data available for download so you can see how it works.