You are waaaay ahead of you horse. You need to have your butt more centered. Make sure you have a lot of bend to that knee so shorten those stirrups. You will be more balanced and not looking like you are about to topple onto her neck.
Keep your elbows in. I see in the second picture you have them out.
Keep your hands closed and not flat on the reins like you have in the third picture.
And you know about releasing.
Are you teaching yourself or taking lessons?