Please realize I ride Western. I don't like your back or hand position. Your stirrups seem too short. In Western, at least, when stopping your feet should be forward. When you place your toes up and your feet forward you clue your horse that it's time to stop.
Look at how arched your back is. It shouldn't be like that. You should sit on the meaty part of your bottom. That will help straighten your back. I'm not a great Wiki fan but if you look at this picture you'll notice that this rider's back is much straighter than yours. You'll find this more comfortable and more stable in the long term.
You appear tense and not comfortable. Your eyes appear to be looking down. You should look forward and not down.
Trissacar- You asked for critique and that's what they are giving you.
I agree with everyone else... if you listen to Spyder and Joshie your halt will look great. :) Just relax and remember a halt comes from your seat and the hind quarters.
Ok clearly everyone is not seeing what I am. The front legs are slightly uneven the back legs are too and not enough engaged but overall a nice halt.
This shouldn't surprise me but it does. I guess that's why people tell me I should be a judge.
Thank ya'll! I'll try to think about what you've said.
You are tensing which does translate to your horse - if you can learn to relax your pelvis and let it rotate back to "neutral" (you have it rotate backwards now, creating a hollow back) that will solve a lot of your problems. It does look like she might be leaning on the bit ever so slightly, whereas the horse in the post that Spyder made was light in the forehand, which is what you want to accomplish.
There are some really knowledgable people on this forum that have offered some really great advice - your horse and yourself look like a great match, imagine what you could do once you get everything sorted out!