Very nicely done! The only thing I would have done differently is to walk him back to the original spot you asked him to sit and sent him from there rather than from where he walked to. Next step is some memory retrieves.
I was taught that years ago in dog training classes to always take your dog back to the original spot. If Hattie or Charlie break they look at me as if to say "OK I'm going back" and follow me straight back It's very worthwhile doing this x
