Proper form is the easiest to repeat in a hunting situation.Proper form utilizes things your body wants to do naturally.When you get too many things going on,like when improper form is used,this can cause problems in a tree.
Proper form should be tried to be learned by all.Some draw length adjustments can be made from target to hunting because of clothing and weather but for the most part,good form pays off in the hunting woods as much as in the target world.
There are things ,like feet width that need to be adjusted for a tree stand but understanding a proper base(foundation)and then being able to translate it to the tree is a must imo.
Everything Matt said is spot on.
IMO,your bow hand is too far into the grip(way too much palm).There is also way to much tension in the fingers.Allow the fingers to just lay there,completely relaxed.
You are not leaning back or leaning forward imo.Your hips are pushed forward.This gives the appearance of leaning but you are not.If you look at your shoulders,in relation to your feet.they look good.(atleast from what I can tell)They are in line but your hips are forward,pull the hips back and you should be good.
It feels awkward at first because you are not used to it when shooting the bow.Try standing in front of a mirror and look at yourself.All you are trying to do is stand up straight,like I am sure you do most of the time.(this is the kind of things I mean when I say doing what your body wants to do)
Some coaches will like your bow arm.I like straight but you look like your arm is locked and imo,it should be relaxed but straight.I believe locking the arm puts too much tension on it and doesn't take long to fatigue.( if you say it isn't locked,good enough.I am looking at a pictur and not there in person)
I am also noticing that the bow is pointed down.You should always pull the bow back and anchor level to the ground,THEN bend at the waist for downhill or uphill shots.
Just a few things I noticed.
Absolute perfect formisn't necessary to kill a deer but it does give you a better chance,imo to have a succesful shot.[:-]