I don't really think draw length is an issue, might be a touch long, but not much. I think you have three issues to fix:

1) Grip, you are way to far into the hand, get the bow out between the thumb joint and first line on your palm, you are way to wrapped into the bow which will bring your forearm in.

2) elbow is facing the floor which rotates the forearm in. rotate your elbow out a bit

3) bow shoulder is up and hunched toward your body. Lower that shoulder, this will in effect push the bow away from you a bit (which is why I say draw length may not be to long). Look at your chin it is almost touching your shoulder. Draw a line, parallel to the floor from your left shoulder to your right shoulder, you will see they are not at the same level.

Fix those 3 and try again, if you still wack the arm, open your stance up a bit (drop your right foot back 6 inches away from parallel to the target line), this will open up your upper body creating a bigger angle between the bow and your arm. Not ideal for bone on bone alignment, but a quick fix.