re: And details on the ground
Not sure if this shows anything, but that's a very bright feature that stands out on this one for me since I first saw it. If it is the backshell, then the parachute shouldn't be far, yet it's the only bright and unusually shaped object in view. In contrast, the heat shield could be a very dark feature to look for. On the other hand, the 'mast' the camera is on may not be high enough and Phoenix's remnants may be too far to spot.
Either way, the MRO/team deserves high praise (no pun intended).