Your western pix are way better than your english, you even have him pretty much underneath himself and on the bit... he's a little strung out and could be more collected but WAY better than english. I think you may be a western rider.
Your stirrup length looks ok however I would go ahead and shorten them one or two holes because you are reaching for them, until you can get your heels down you really should go ahead and ride w/ just one or two holes shorter. Work on stretching your legs down and do your heel excersizes. You need to move your lower leg back just a bit but in all, your western pix are really cute. You are sitting up straight, your shoulders are back you look comfortable... The sidesaddle pic you actually ahve your heels down!
If you can get your leg back and heel down western, that will really help you with your english too. Part of why your english is so strung out and sloppy is because you are reaching so much for your stirrups, you have alot of movement in your legs.
Very cute pix though! Way better than your Devon shots!!!