Be careful not to 'grip' the horse with your knees, or have too much leg contact with the horse un-neccisarily - some horses are not bothered by continuous leg contact, others get really quiet annoyed by it. Getting your heels down will not fix all of your problems, but it will be a big step in improving everything and it all coming together nicely.
I hope I explained this well enough for you. Keep up the excellent progress.
In both recent pictures my attention is drawn to how my toes stick out and I can't seem to fix this, if anyone has any tips?