I feel your "pain"!! Lol! Getting good pictures is definitely not always ever easy!!
Posty means that their back legs are strait or only have a little curve to them (like Thor). You want to see a nice curve on the back of their rear legs. Hope that made sense. It's kind of hard to explain!
IMO, Tater has great rear leg angulation. See the nice curve on the back of his rear legs?
I'm hoping he fills out more as he grows as he's still pretty young... I know it's harder to tell this is Dam Calypso and Sire Blue Mako! His full name is Fox Acres MC CalypsoBlues Thor! Thanks to @FoxRidge !