He looks perfect in the first picture. His legs are a bit too far back in the second. He could be a hair back in the rear in the first pic if you wanted to really nitpick to make his hocks perfectly perpendicular to the ground. Remember, you want his hocks straight up and down, perpendicular to the ground. Typically this means they are standing up on their toes. If you look in the second picture too, because his legs are too far back it creates a dip in his top line right before his hip junction. A perfect top line should have no waves or dips so you'll want to do your best to not create issues where there are none.
His neck looks beautiful in the first too. For neck position you can play around with it and see what helps make any neck/shoulder wrinkles disappear. You want there to be a smooth flow from head to tail. He's a puppy so he is going to have some wrinkles but you can still practice with it now because some always do have some wrinkles even if it isn't correct and it can be distracting. If you see in the second picture his neck is stretched up a little higher and so the neck to shoulder transition looks smoother. So I would play around with it and see if you can get his neck up and head bent while smoothing out his shoulder the best you can! The beautiful head bent at the poll is for when the judge is looking at side profile. When the judge comes from the front, you will want the neck up and to keep the head planes level with the ground.
I would have your camera a little higher so its not looking under him so much.
If you don't want to always bait with your hand, you can practice standing beside him and tossing or spitting bait out ahead of him, tell him to "watch" and you watch for a slight weight shift forward. Release him soon as he shifts or leans forward with "get it!" or "break!" or whatever release word you want. Do this enough he'll start leaning into that stack and makes them look really impressive while your hands are free to fiddle with cleaning up the face, lips, skin around the neckline, tickling the tail etc.
Y'all are doing amazing! He looks really really good and you're doing such a great job with him. I think you guys are going to go far and have a ton of fun!