I'm with Anebel... lengthen your stirrups and the put a conscious effort in pulling your lower leg back while keeping your seat in the correct position. Pull your shoulders back and ride! I actually do think I see improvement from the earlier pics to the older pics but I think you'll see a big difference when you drop your stirrup length... It's a good length for jumping... but not flat...
"Be a best friend, tell the truth, and overuse I love you
Go to work, do your best, don't outsmart your common sense
Never let your prayin knees get lazy
And love like crazy"