Here is a good pic(video) of some really good form.
Here is one of me a little too short.
http://youtube.com/watch?v=YYwcNVjcjgU
Look at my front shoulder.It is starting to work up on me.I am actually shooting this draw length now but with a longer loop.If you could see me from the back,you would see my elbow is way out on me.I just can't get it back far enough with this drawlength.
Here is one of me a little too long.About a 1/4" is all but enough for me to notice.
http://youtube.com/watch?v=YdXv0cKiFC8
Here is a pic of strictly target form.I am nota big fan of the cocked wrist on his release hand but that is one of those things that works for him and quite well,I might add

. He does show you how you should try and wrap your finger over the release triggerto execute a proper shot.
Most will say not to lock the elbow but it is really a matter of preference and may not be best in hunting attire but it can be done.
As you can see in your picture,you are nowhere close to any of these pics or theprevious posters pics.You are definately long andwith a release that isn't set up right for you.