Re: Critique on me mostly
If you can get ahold of a mirror, you can place that against a wall and that way you can see what you are doing while you are stacking.
I agree with the others, the front legs should be a little straighter under the body, and the hock should also be straight up and down, at a 90degree angle to the ground.
Your front legs are pretty close, I find that getting the dog's attention and getting them to lean forward towards that makes for a prettier picture, this is why some handlers throw treats or toys (which many other exhibitors and judges find rude). When I am trying to take stacked photos on my own at home, I place the feet, put the dog in a stay, then throw toys in front of them to get them to look forward.
Don't know which venue you are planning to show in, SV, AKC, UKC, but I know for AKC and UKC you want to make sure the show collar is right underneath the jawline, so as high up on the neck as possible, this shows the head off better.