Originally posted by dankes
No look at all 3 SPGs profile.
SU-152 is much lower than ISU -1*2.
Yes good idea, and re-read my post carefully, as in
"The superstructure is too high to be a SU vehicle."

Do a measurement on the photo.
superstructure height from bottom of superstructure = height to bottom of superstructure from the ground
So thank you for confirming is an ISU vehicle.

Further proof it is an ISU vehicle, the forward return roller is closer to the second bogey wheel on the IS vehicle which but on the ISU it is positioned between the 1st and 2cd bogeys(as per your profiles)
though shows a 152 not the 122,
http://www.onwar.com/tanks/ussr/plans/isu152_44.gifwhich shows no PK periscope, different roof vents as does the photo, as does your profiles
Take a good look at the gun barrel.
photo = ISU-122