>>937493875
My guess would be it's just a scale issue. The AI isn't used to draw hands that big in relation to the body so it doesn't have a good idea of what to do. Keep in mind that the AI has absolutely no idea of what a "hand" is, it only thinks about it in relation to other pictures that have hands in them, which is 99% going to be hands that are proportional to the person in the picture. Some models might be better at it than others but without a specific lora that's always going to be something that's harder than normal.

In other words, keep trying and hope you get a lucky result.