Re: figure drawing from today
Not sure if it was unsuccessful: this one has good structure and proportions, she is definitely sitting there. One suggestion, I like how you've drawn the left foot but something that works for me is to just hint at the line/gap between the big toe and rest to give more direction to the foot. It is not always true with models that this is emphasized (particularly with long toed models) but it seems to work.
I'd be interested to see your other drawings but I recognise that sometimes the success of the experiments is to try something else rather than the end results (it all adds to the learning experience).
C&C always appreciated.